id large_stringlengths 9 16 | title large_stringlengths 1 382 | abstract large_stringlengths 3 6.09k | publish_date date32 | update_date date32 | categories large listlengths 1 13 | authors large_stringlengths 3 62.8k |
|---|---|---|---|---|---|---|
cond-mat/9511117 | Fast Algorithms For Josephson Junction Arrays : Bus--bars and Defects | We critically review the fast algorithms for the numerical study of
two--dimensional Josephson junction arrays and develop the analogy of such
systems with electrostatics. We extend these procedures to arrays with
bus--bars and defects in the form of missing bonds. The role of boundaries and
of the guage choice in dete... | 1995-11-23 | 2009-10-28 | [
"cond-mat"
] | Sujay Datta, Shantilal Das, Deshdeep Sahdev, Ravi Mehrotra and Subodh
R. Shenoy |
cond-mat/9511112 | Effect of Random Impurities on Fluctuation-Driven First Order
Transitions | We analyse the effect of quenched uncorrelated randomness coupling to the
local energy density of a model consisting of N coupled two-dimensional Ising
models. For N>2 the pure model exhibits a fluctuation-driven first order
transition, characterised by runaway renormalisation group behaviour. We show
that the addition... | 1995-11-23 | 2016-08-31 | [
"cond-mat"
] | John Cardy (University of Oxford) |
cond-mat/9511116 | Spin density wave selection in the one-dimensional Hubbard model | The Hartree-Fock ground state phase diagram of the one-dimensional Hubbard
model is calculated, constrained to uniform phases, which have no charge
density modulation. The allowed solutions are saturated ferromagnetism (FM), a
spiral spin density wave (SSDW) and a double spin density wave} (DSDW). The
DSDW phase compri... | 1995-11-23 | 2009-10-28 | [
"cond-mat"
] | J H Samson (Department of Physics, Loughborough University of
Technology, UK) |
cond-mat/9511108 | Diffusion of electrons in two-dimensional disordered symplectic systems | Diffusion of electrons in two-dimensional disordered systems with spin-orbit
interactions is investigated numerically. Asymptotic behaviors of the second
moment of the wave packet and of the temporal auto-correlation function are
examined. At the critical point, the auto-correlation function exhibits the
power-law deca... | 1995-11-22 | 2009-10-28 | [
"cond-mat"
] | Tohru Kawarabayashi and Tomi Ohtsuki |
cond-mat/9511106 | Static properties of a quasi one-dimensional antiferromagnet in magnetic
field | We calculate the effect of zero-point fluctuations on the magnetostatic
properties of a quasi one-dimensional antiferromagnetic helimagnet with and
without in-plane anisotropy. We find substantial reduction of the uniform
susceptibility and the sublattice magnetization from their classical values and
appreciable renorm... | 1995-11-22 | 2009-10-28 | [
"cond-mat"
] | M. E. Zhitomirsky and I. A. Zaliznyak |
cond-mat/9511109 | The spin 1/2 Heisenberg star with frustration II: The influence of the
embedding medium | We investigate the spin 1/2 Heisenberg star introduced in J. Richter and A.
Voigt, J. Phys. A: Math. Gen. {\bf 27}, 1139 (1994). The model is defined by
$H=J_1 \sum_{i=1}^{N}{{\bf s}_0{\bf s}_i} + J_2 H_{R}\{{\bf s}_i\}$ ; $J_1,J_2
\ge 0$ , $i=1,...,N$. In extension to the Ref. we consider a more general
$H_{R}\{{\bf s... | 1995-11-22 | 2009-10-28 | [
"cond-mat"
] | Johannes Richter, Andreas Voigt, Sven E. Kr\"uger (Institut f"uer
Theoretische Physik, Universitaet Magdeburg) and Claudius Gros (Institut
f"uer Physik, Universitaet Dortmund) |
cond-mat/9511103 | Supercurrent flow through an effective double barrier structure | Supercurrent flow is studied in a structure that in the Ginzburg-Landau
regime can be described in terms of an effective double barrier potential. In
the limit of strongly reflecting barriers, the passage of Cooper pairs through
such a structure may be viewed as a realization of resonant tunneling with a
rigid wave fun... | 1995-11-21 | 2009-10-28 | [
"cond-mat"
] | I.Zapata and F. Sols |
cond-mat/9511105 | A Model for Force Fluctuations in Bead Packs | We study theoretically the complex network of forces that is responsible for
the static structure and properties of granular materials. We present detailed
calculations for a model in which the fluctuations in the force distribution
arise because of variations in the contact angles and the constraints imposed
by the fo... | 1995-11-21 | 2009-10-28 | [
"cond-mat"
] | S.N. Coppersmith, C.-h. Liu, S. Majumdar, O. Narayan, T.A. Witten |
cond-mat/9511102 | Kac-Moody Symmetries of Critical Ground States | The symmetries of critical ground states of two-dimensional lattice models
are investigated. We show how mapping a critical ground state to a model of a
rough interface can be used to identify the chiral symmetry algebra of the
conformal field theory that describes its scaling limit. This is demonstrated
in the case of... | 1995-11-21 | 2009-10-28 | [
"cond-mat",
"hep-th"
] | J. Kondev (Brown U.) and C.L. Henley (Cornell U.) |
cond-mat/9511104 | Oscillating density of states near zero energy for matrices made of
blocks with possible application to the random flux problem | We consider random hermitian matrices made of complex blocks. The symmetries
of these matrices force them to have pairs of opposite real eigenvalues, so
that the average density of eigenvalues must vanish at the origin. These
densities are studied for finite $N\times N$ matrices in the Gaussian ensemble.
In the large $... | 1995-11-21 | 2009-10-28 | [
"cond-mat",
"hep-th"
] | E. Br\'ezin, S. Hikami, A. Zee |
cond-mat/9511101 | Rigorous Density Functional Theory for Inhomogeneous Bose-Condensed
Fluids | The density functional theory originally developed by Hohenberg, Kohn and
Sham provides a rigorous conceptual framework for dealing with inhomogeneous
interacting Fermi systems. We extend this approach to deal with inhomogeneous
interacting Bose-condensed systems, limiting this presentation to setting up
the formalism ... | 1995-11-20 | 2015-06-25 | [
"cond-mat"
] | A. Griffin (University of Toronto) |
cond-mat/9511091 | Random Walk Approach to Simple Evolution Model | The dynamics of the avalanche width in the evolution model is described using
a random walk picture. In this approach the critical exponents for avalanche
distribution, $\tau$, and avalanche average time, $\gamma$, are found to be the
same as in the previous mean field approximation but SOC appear at
$\lambda_{critical... | 1995-11-20 | 2008-02-03 | [
"cond-mat"
] | L. Anton |
cond-mat/9511098 | Superconductivity in the Cuprates as a Consequence of Antiferromagnetism
and a Large Hole Density of States | We briefly review a theory for the cuprates that has been recently proposed
based on the movement and interaction of holes in antiferromagnetic (AF)
backgrounds. A robust peak in the hole density of states (DOS) is crucial to
produce a large critical temperature once a source of hole attraction is
identified. The predi... | 1995-11-20 | 2009-10-28 | [
"cond-mat"
] | E. Dagotto, A. Nazarenko, A. Moreo, and S. Haas (NHMFL/FSU) |
cond-mat/9511093 | Phase Diagram of a Model of Correlated Hopping of Electrons in a Lattice
of Berry Molecules | The $1D$ phase diagram of a model for correlated hopping of electrons in a
lattice of Berry phase molecules is presented. Electrons hop in presence of an
extra orbital degree of freedom at each site. This is mimicked as a spin-1
variable whose allowed states depend on the electron occupancy so as to take
into account t... | 1995-11-20 | 2012-10-30 | [
"cond-mat"
] | Giuseppe Santoro, Nicola Manini, Alberto Parola, and Erio Tosatti |
cond-mat/9511097 | Dynamic Light Scattering from Semidilute Actin Solutions: A Study of
Hydrodynamic Screening, Filament Bending Stiffness and the Effect of
Tropomyosin/Troponin-Binding | Quasi-elastic light scattering (QELS) is applied to investigate the effect of
the tropomyosin/troponin complex (Tm/Tn) on the stiffness of actin filaments.
The importance of hydrodynamic screening in semidilute solutions is
demonstrated. A new concentration dependent expression for the dynamic
structure factor $g(\bm k... | 1995-11-20 | 2009-10-28 | [
"cond-mat"
] | R. Goetter, K. Kroy, E. Frey, M. Baermann, E. Sackmann |
cond-mat/9511100 | Surface Region of Superfluid Helium as an Inhomogeneous Bose-Condensed
Gas | We present arguments that the low density surface region of self-bounded
superfluid $^4$He systems is an inhomogeneous dilute Bose gas, with almost all
of the atoms occupying the same single-particle state at $T = 0$. Numerical
evidence for this complete Bose-Einstein condensation was first given by the
many-body varia... | 1995-11-20 | 2009-10-28 | [
"cond-mat"
] | A. Griffin (University of Toronto) and S. Stringari (University of
Trento) |
cond-mat/9511094 | Theory for the nonlinear optical response of a nonspherical metal
cluster | Using classical electrodynamics we determine the higher harmonic radiation by
a nonspherical metal cluster in form of a matrix formalism. Extending the
theory for the source of the higher harmonic radiation for spherical metal
clusters as introduced by \"Ostling et al. [Z. Phys. D {\bf 28}, 169 (1993)] we
calculate the... | 1995-11-20 | 2016-08-31 | [
"cond-mat"
] | J.P.Dewitz, W.Huebner, K.H.Bennemann |
cond-mat/9511095 | Preroughening, Diffusion, and Growth of An FCC(111) Surface | Preroughening of close-packed fcc(111) surfaces, found in rare gas solids, is
an interesting, but poorly characterized phase transition. We introduce a
restricted solid-on-solid model, named FCSOS, which describes it. Using mostly
Monte Carlo, we study both statics, including critical behavior and scattering
properties... | 1995-11-20 | 2009-10-28 | [
"cond-mat"
] | S. Prestipino, G. Santoro, and E. Tosatt |
cond-mat/9511096 | On the Spin Gap Phase of Strongly-Correlated Electrons | We discuss the possible existence of a spin-gap phase in the low-doping
regime of strongly-correlated two-dimensional electrons within the gauge field
description of the t-J model. The spin-gap phase was recently shown by Ubbens
and Lee to be destroyed by gauge field quantum fluctuations for a single-layer
2D system in... | 1995-11-20 | 2009-10-28 | [
"cond-mat"
] | P. Lederer, Elihu Abrahams |
cond-mat/9511099 | Transverse Magnetoresistance of GaAs/AlGaAs Heterojunctions in the
Presence of Parallel Magnetic Fields | We have calculated the resistivity of a GaAs\slash AlGaAs heterojunction in
the presence of both an in--plane magnetic field and a weak perpendicular
component using a semiclassical Boltzmann transport theory. These calculations
take into account fully the distortion of the Fermi contour which is induced by
the paralle... | 1995-11-20 | 2009-10-28 | [
"cond-mat"
] | J.M. Heisz and E. Zaremba |
cond-mat/9511092 | Ground States and Flux Configurations of the Two-dimensional
Falicov-Kimball Model | The Falicov-Kimball model is a lattice model of itinerant spinless fermions
("electrons") interacting by an on-site potential with classical particles
("ions"). We continue the investigations of the crystalline ground states that
appear for various filling of electrons and ions, for large coupling. We
investigate the m... | 1995-11-20 | 2008-02-03 | [
"cond-mat"
] | Ch. Gruber, N. Macris, A. Messager and D. Ueltschi |
cond-mat/9511090 | An Ising model in a magnetic field with a boundary | We obtain the diagonal reflection matrices for a recently introduced family
of dilute ${\rm A}_L$ lattice models in which the ${\rm A}_3$ model can be
viewed as an Ising model in a magnetic field. We calculate the surface free
energy from the crossing-unitarity relation and thus directly obtain the
critical magnetic su... | 1995-11-19 | 2009-10-28 | [
"cond-mat",
"hep-th"
] | Murray T. Batchelor, Vlad Fridkin and Yu-kui Zhou |
cond-mat/9511088 | T-Matrix Formulation of Impurity Scattering in Correlated Systems | Using a generalized T-matrix description which, in principle, exactly
includes Coulomb correlations and potential scattering events, resonant and
bound impurity states are discussed. Like in the non-interacting case, the
effects of the scattering potential can be divided into different partial wave
channels, exploiting... | 1995-11-17 | 2009-10-28 | [
"cond-mat"
] | W. Ziegler, D. Poilblanc, R. Preuss, W. Hanke, D. J. Scalapino |
cond-mat/9511087 | The incoherent part of the spin-wave polarization operator in the t-J
model | A calculation of the spin-wave polarization operator is very important for
the analysis of the magnetic structure of high temperature superconductors. We
analyze the significance of the incoherent part of the spin-wave polarization
operator within the framework of the t-J model. This part is calculated
analytically for... | 1995-11-17 | 2015-06-25 | [
"cond-mat"
] | D. W. Murray and O. P. Sushkov |
cond-mat/9511085 | Spectral Anomaly and High Temperature Superconductors | Spectral anomaly for interacting Fermions is characterized by the spectral
function $A([k-k_F],\omega)$ satisfying the scaling relation $A(\Lambda^{y_1}
[k-k_F],\Lambda^{y_2}\omega)= \Lambda^{y_A}A([k-k_F],\omega)$, where $y_1$,
$y_2$, and $y_A$ are the exponents defining the universality class. For a Fermi
liquid $y_1... | 1995-11-17 | 2015-06-25 | [
"cond-mat"
] | L. Yin and S. Chakravarty |
cond-mat/9511089 | Dynamics within metastable states in a mean-field spin glass | In this letter we present a dynamical study of the structure of metastable
states (corresponding to TAP solutions) in a mean-field spin-glass model. After
reviewing known results of the statical approach, we use dynamics: starting
from an initial condition thermalized at a temperature between the statical and
the dynam... | 1995-11-17 | 2009-10-28 | [
"cond-mat"
] | A. Barrat, R. Burioni and M. M\'ezard |
cond-mat/9511086 | The Isotope Effect in d-Wave Superconductors | Based on recently proposed anti-ferromagnetic spin fluctuation exchange
models for $d_{x^2-y^2}$-superconductors, we show that coupling to harmonic
phonons {\it{cannot}} account for the observed isotope effect in the cuprate
high-$T_c$ materials, whereas coupling to strongly anharmonic multiple-well
lattice tunneling m... | 1995-11-17 | 2009-10-28 | [
"cond-mat"
] | H.-B. Sch\"uttler, C.-H. Pao |
cond-mat/9511081 | Surface Free Energies and Surface Critical Behaviour of the ABF Models
with Fixed Boundaries | In a previous paper, we introduced reflection equations for
interaction-round-a-face (IRF) models and used these to construct commuting
double-row transfer matrices for solvable lattice spin models with fixed
boundary conditions. In particular, for the Andrews-Baxter-Forrester (ABF)
models, we derived special functiona... | 1995-11-16 | 2009-10-28 | [
"cond-mat",
"hep-th"
] | David L. O'Brien, Paul A. Pearce and Roger E. Behrend |
cond-mat/9511082 | What is the Thouless Energy for Ballistic Systems? | The Thouless energy, $\Ec$ characterizes numerous quantities associated with
sensitivity to boundary conditions in diffusive mesoscopic conductors. What
happens to these quantities if the disorder strength is decreased and a
transition to the ballistic regime takes place? In the present analysis we
refute the intuitive... | 1995-11-16 | 2009-10-28 | [
"cond-mat"
] | Alexander Altland, Yuval Gefen, Gilles Montambaux |
cond-mat/9511083 | Analytic Formulations of the Density Matrix Renormalization Group | We present two new analytic formulations of the Density Matrix
Renormalization Group Method. In these formulations we combine the block
renormalization group (BRG) procedure with Variational and Fokker-Planck
methods. The BRG method is used to reduce the lattice size while the latter are
used to construct approximate t... | 1995-11-16 | 2015-06-25 | [
"cond-mat",
"hep-th"
] | Miguel A. Martin-Delgado and German Sierra |
cond-mat/9511084 | Series expansions of the percolation probability on the directed
triangular lattice | We have derived long series expansions of the percolation probability for
site, bond and site-bond percolation on the directed triangular lattice. For
the bond problem we have extended the series from order 12 to 51 and for the
site problem from order 12 to 35. For the site-bond problem, which has not been
studied befo... | 1995-11-16 | 2009-10-28 | [
"cond-mat"
] | Iwan Jensen and Anthony J. Guttmann |
cond-mat/9511076 | The Ideal Conductor Limit | This paper compares two methods of statistical mechanics used to study a
classical Coulomb system S near an ideal conductor C. The first method consists
in neglecting the thermal fluctuations in the conductor C and constrains the
electric potential to be constant on it. In the second method the conductor C
is considere... | 1995-11-15 | 2009-10-28 | [
"cond-mat"
] | B. Jancovici and G. Tellez |
cond-mat/9511073 | Transverse Sound Revisited: A Directional Probe of the A-Phase of
$UPt_3$ | We have measured the transverse ultrasonic attenuation, $\alpha_{q\epsilon}$,
in a well-characterized single crystal of $UPt_3$ for propagation direction,
${\bf q}$, in the basal plane and polarization, $\epsilon$, in and out of the
plane. Unlike previous measurements, the sample was of sufficient purity to
exhibit thr... | 1995-11-15 | 2009-10-28 | [
"cond-mat"
] | Brett Ellman and Louis Taillefer (McGill University) and Mario Poirier
(Universite de Sherbrooke) |
cond-mat/9511080 | Resonant Two-Magnon Raman Scattering in Cuprate Antiferromagnetic
Insulators | We present results of low-temperature two-magnon resonance Raman excitation
profile measurements for single layer Sr_2CuO_2Cl_2 and bilayer YBa_2Cu_3O_{6 +
\delta} antiferromagnets over the excitation region from 1.65 to 3.05 eV. These
data reveal composite structure of the two-magnon line shape and strong
nonmonotic d... | 1995-11-15 | 2009-10-28 | [
"cond-mat",
"supr-con"
] | G. Blumberg, P. Abbamonte, M. V. Klein, L. L. Miller, W. C. Lee, and
D. M. Ginsberg |
cond-mat/9511077 | Interacting electrons in disordered potentials: Conductance versus
persistent currents | An expression for the conductance of interacting electrons in the diffusive
regime as a function of the ensemble averaged persistent current and the
compressibility of the system is presented. This expression involves only
ground-state properties of the system. The different dependencies of the
conductance and persiste... | 1995-11-15 | 2009-10-28 | [
"cond-mat"
] | Richard Berkovits and Yshai Avishai |
cond-mat/9511078 | Mesh Currents and Josephson Junction Arrays | A simple but accurate mesh current analysis is performed on a XY model and on
a SIMF model to derive the equations for a Josephson junction array. The
equations obtained here turn out to be different from other equations already
existing in the literature. Moreover, it is shown that the two models come from
an unique h... | 1995-11-15 | 2008-02-03 | [
"cond-mat"
] | Carlo Lucheroni (Dipartimento di Fisica, Universita' di Perugia,
Perugia, Italy) |
cond-mat/9511074 | Phase diagram of depleted Heisenberg model for CaV4O9 | We have numerically investigated the 1/5-depleted Heisenberg square lattice
representing CaV4O9 using the Quantum Monte Carlo loop algorithm. We have
determined the phase diagram of the model as a function of the ratio of the two
different couplings: bonds within a plaquette and dimer bonds between
plaquettes. By calcu... | 1995-11-15 | 2007-05-23 | [
"cond-mat"
] | Matthias Troyer, Hiroshi Kontani and Kazuo Ueda |
cond-mat/9511072 | Similarity-Detection and Localization | The detection of similarities between long DNA and protein sequences is
studied using concepts of statistical physics. It is shown that mutual
similarities can be detected by sequence alignment methods only if their amount
exceeds a threshold value. The onset of detection is a continuous phase
transition which can be v... | 1995-11-15 | 2009-10-28 | [
"cond-mat",
"comp-gas",
"nlin.CG",
"q-bio.QM"
] | Terence Hwa (UC San Diego) and Michael Lassig (Max-Planck Inst) |
cond-mat/9511079 | Doped planar quantum antiferromagnets with striped phases | We study the properties of the striped phases that have been proposed for the
doped cuprate planar quantum antiferromagnets. We invoke an effective,
spatially anisotropic, non-linear sigma model in two space dimensions. Our
theoretical predictions are in {\it quantitative} agreement with recent
experiments. We focus on... | 1995-11-15 | 2009-10-28 | [
"cond-mat"
] | A.H. Castro Neto and Daniel Hone |
cond-mat/9511071 | Influence of oxygen ordering kinetics on Raman and optical response in
YBa_2Cu_3O_{6.4} | Kinetics of the optical and Raman response in YBa_2Cu_3O_{6.4} were studied
during room temperature annealing following heat treatment. The superconducting
T_c, dc resistivity, and low-energy optical conductivity recover slowly,
implying a long relaxation time for the carrier density. Short relaxation times
are observe... | 1995-11-15 | 2009-10-28 | [
"cond-mat",
"supr-con"
] | A. A. Maksimov, D. A. Pronin, S. V. Zaitsev, I. I. Tartakovskii, G.
Blumberg, M. V. Klein, M. Karlow, S. L. Cooper, A.P. Paulikas, and B. W. Veal |
cond-mat/9511075 | Stability, dynamical properties and melting of a classical bi-layer
Wigner Crystal | We investigate the stability, the dynamical properties and melting of a
two-dimensional (2D) Wigner crystal (WC) of classical Coulombic particles in a
bi-layer structure. Compared to the single-layer WC, this system shows a rich
phase diagram. Five different crystalline phases are stable; the energetically
favoured str... | 1995-11-15 | 2009-10-28 | [
"cond-mat"
] | G.Goldoni, F.M.Peeters (University of Antwerp (UIA), Belgium) |
cond-mat/9511061 | Topological Phase Transition in the $\nu=2/3$ Quantum Hall Effect | The double layer $\nu=2/3$ fractional quantum Hall system is studied using
the edge state formalism and finite-size diagonalization subject to periodic
boundary conditions. Transitions between three different ground states are
observed as the separation as well as the tunneling between the two layers is
varied. Experim... | 1995-11-14 | 2009-10-28 | [
"cond-mat"
] | I. A. McDonald and F. D. M. Haldane |
cond-mat/9511063 | Applications of Wavelets to Quantum Mechanics: a Pedagogical Example | We discuss in many details two quantum mechanical models of planar electrons
which are very much related to the Fractional Quantum Hall Effect. In
particular, we discuss the localization properties of the trial ground states
of the models starting from considerations on the numerical results on the
energy. We conclude ... | 1995-11-14 | 2009-10-28 | [
"cond-mat"
] | Fabio Bagarello |
cond-mat/9511064 | Properties of the t-J Model in the Dynamical Mean Field Theory:
One-Particle Properties in the Antiferromagnetic Phase | We study the one-particle properties of the t-J model within the framework of
Vollhardt's dynamical mean field theory. By introducing an AB - sublattice
structure we explicitely allow for a broken symmetry for the spin degrees of
freedom and are thus able to calculate the one-particle spectral function in
the antiferro... | 1995-11-14 | 2007-05-23 | [
"cond-mat"
] | Thomas Obermeier, Thomas Pruschke, Joachim Keller |
cond-mat/9511065 | Non-RKKY oscillations of exchange coupling in magnetic multilayers | It is shown how the exchange coupling between two ferromagnetic planes
embedded in an infinite non-magnetic metal, regarded as a function of the
distance between the planes, may contain important components which oscillate
with periods not predicted by RKKY theory. The interesting case of a FCC(110)
structure with a Cu... | 1995-11-14 | 2007-05-23 | [
"cond-mat"
] | M. S. Ferreira, J. d'Albuquerque e Castro, D. M. Edwards and J. Mathon |
cond-mat/9511068 | Scanning Tunneling Microscopy and Tunneling Luminescence of the Surface
of GaN Films Grown by Vapor Phase Epitaxy | We report scanning tunneling microscopy (STM) images of surfaces of GaN films
and the observation of luminescence from those films induced by highly
spatially localized injection of electrons or holes using STM. This combination
of scanning tunneling luminescence (STL) with STM for GaN surfaces and the
ability to obser... | 1995-11-14 | 2009-10-28 | [
"cond-mat"
] | B. Garni, Jian Ma, N. Perkins, Jutong Liu, T.F. Kuech, and M.G.
Lagally (University of Wisconsin -Madison, Madison, WI) |
cond-mat/9511069 | Local Moments Coupled to a Strongly Correlated Electron Chain | A 1D model hamiltonian that is motivated by the recent discovery of the
heavy-fermion behavior in the cuprates of the $Nd_2CuO_4$ type is studied. It
consists of $t-J$ interacting conduction electrons coupled to a lattice of
localized spins through a Kondo exchange term $J_K$. Exact diagonalization and
density matrix r... | 1995-11-14 | 2009-10-28 | [
"cond-mat"
] | Samuel Moukouri, Liang Chen and Laurent G. Caron (Sherbrooke Un.) |
cond-mat/9511067 | Excitonic Phase Transition in Electronic Systems | Although predicted theoretically excitonic phase transitions have never been
observed. Recently it has been claimed that they can occur in some strongly
correlated materials. We study the possibility of an excitonic transition in a
two-band model and show that a true phase transition never occurs in the
presence of hyb... | 1995-11-14 | 2009-10-28 | [
"cond-mat"
] | M.A.Continentino (Universidade Federal Fluminense and National High
Magnetic Field Laboratory), G.M.Japiassu (Universidade Federal do Rio de
Janeiro), A.Troper (Centro Brasileiro de Pesquisas Fisicas) |
cond-mat/9511066 | Phenomenological approach to non-linear Langevin equations | In this paper we address the problem of consistently construct Langevin
equations to describe fluctuations in non-linear systems. Detailed balance
severely restricts the choice of the random force, but we prove that this
property together with the macroscopic knowledge of the system is not enough to
determine all the p... | 1995-11-14 | 2007-05-23 | [
"cond-mat"
] | J. Bonet Avalos and I. Pagonabarraga |
cond-mat/9511070 | Phase Transitions of the Bilayered Spin-S Heisenberg Model and Its
Extension to Fractional Dimensions | We study the ground state and the phase transitions of the bilayered spin-$S$
antiferromagnetic Heisenberg model using the Schwinger boson mean field theory.
The interplane coupling initially stabilizes but eventually destroys the
long-range antiferromagnetic order. The transition to the disordered state is
continuous ... | 1995-11-14 | 2007-05-23 | [
"cond-mat"
] | Kwai-Kong Ng, Fu Chun Zhang, and Michael Ma (University of Cincinnati) |
cond-mat/9511062 | Excess Resistance Effect in a Normal Metal Contacting a Superconductor | In relatively pure normal samples contacting a superconductor we consider the
excess resistance effect (that is a decrease of the total electrical resistance
of the sample after transition of the superconducting part into the normal
state) and determine conditions under which the effect arises. | 1995-11-14 | 2009-10-28 | [
"cond-mat"
] | A. Kadigrobov, R. Shekhter, and M. Jonson |
cond-mat/9511055 | Heavy Quasiparticles in the Anderson Lattice Model | An exact-diagonalization technique on small clusters is used to study the
dynamics of the one-dimensional symmetric Anderson lattice model. Our
calculated excitation spectra reproduce key features expected for an infinite
Kondo lattice such as nearly localized low-energy spin excitations and extended
regions of `heavy-... | 1995-11-13 | 2009-10-28 | [
"cond-mat"
] | K. Tsutsui, Y. Ohta, R. Eder, S. Maekawa, E. Dagotto, and J. Riera |
cond-mat/9511057 | Absence of zero field muon spin relaxation induced by superconductivity
in the B phase of UPt$_3$ | We present muon spin relaxation measurements performed on crystals of the
heavy fermion superconductor UPt$_3$. In zero applied field, contrary to a
previous report, we do not observe an increase of the internal magnetic field
in the lower superconducting phase (the B phase). Our result gives an
experimental upper boun... | 1995-11-13 | 2009-10-28 | [
"cond-mat"
] | P. Dalmas de R\'eotier, A. Huxley, A. Yaouanc, J. Flouquet, P.
Bonville, P. Imbert, P. Pari, P.C.M. Gubbens and A.M. Mulders |
cond-mat/9511058 | Phase ordering kinetics of the Bose gas | We study the approach to equilibrium of a Bose gas to a superfluid state. We
point out that dynamic scaling, characteristic of far from equilibrium
phase-ordering systems, should hold. We stress the importance of a
non-dissipative Josephson precession term in driving the system to a new
universality class. A model of c... | 1995-11-13 | 2009-10-28 | [
"cond-mat",
"atom-ph"
] | Kedar Damle, Satya Majumdar and Subir Sachdev (Yale University) |
cond-mat/9511056 | Bi-layer Heisenberg model studied by the Schwinger-boson
Gutzwiller-projection method | A two-dimensional bi-layer, square lattice Heisenberg model with different
intraplane($J_{\parallel}$) and interplane($J_{\perp}$) couplings is
investigated. The model is first solved in the Schwinger boson mean-field
approximation. %It is shown that order-disorder transition occurs as the
interplane Coupling %is incre... | 1995-11-13 | 2009-10-28 | [
"cond-mat"
] | T.Miyazaki, I.Nakamura, and D.Yoshioka |
cond-mat/9511059 | Electron capture in GaAs quantum wells via electron-electron and optic
phonon scattering | Electron capture times in a separate confinement quantum well (QW) structure
with finite electron density are calculated for electron-electron (e-e) and
electron-polar optic phonon (e-pop) scattering. We find that the capture time
oscillates as function of the QW width for both processes with the same period,
but with ... | 1995-11-13 | 2009-10-28 | [
"cond-mat"
] | K. Kalna, M. Mosko, and F. M. Peeters |
cond-mat/9511060 | Ferromagnetism in Correlated Electron Systems: Generalization of
Nagaoka's Theorem | Nagaoka's theorem on ferromagnetism in the Hubbard model with one electron
less than half filling is generalized to the case where all possible
nearest-neighbor Coulomb interactions (the density-density interaction $V$,
bond-charge interaction $X$, exchange interaction $F$, and hopping of double
occupancies $F'$) are i... | 1995-11-13 | 2009-10-28 | [
"cond-mat"
] | Marcus Kollar, Rainer Strack and Dieter~Vollhardt |
cond-mat/9511053 | The Magnetic Behavior of the t-J Model | Using the spin-hole coherent state representation, and taking the long range
antiferromagnetic N\'{e}el order as the background of the spin degree part, we
have studied the magnetic behavior of the t-J model in the usual slave boson
and slave fermion treatment of the single occupation constraint, and shown that
we can ... | 1995-11-12 | 2007-05-23 | [
"cond-mat"
] | Yu-Liang Liu (ICTP, Trieste, Italy) |
cond-mat/9511054 | Effect of van Hove Singularities on a Spin Liquid | We determine the properties and leading instabilities of a spin liquid with a
Fermi surface passing near a van Hove singularity. Our study is motivated by
recent photoemission experiments on high $T_c$ cuprates in which it is found
that for the optimally doped material the experimental Fermi surface passes
near a van H... | 1995-11-12 | 2009-10-28 | [
"cond-mat"
] | L. B. Ioffe, A. J. Millis |
cond-mat/9511050 | Study of a toy model and its relation to the Hubbard model with infinite
range hopping | A toy model of strongly correlated fermions is studied using Green function
and functional integration methods. The model exhibits a metal-insulator
transition as the interaction is varied. In the case of unrestricted hopping is
established the equivalence of the model with the Hubbard model with infinite
range hopping... | 1995-11-11 | 2007-05-23 | [
"cond-mat"
] | Flavio S. Nogueira and Enrique V. Anda |
cond-mat/9511052 | Dynamics of Random Networks: Connectivity and First Order Phase
Transitions | The connectivity of individual neurons of large neural networks determine
both the steady state activity of the network and its answer to external
stimulus. Highly diluted random networks have zero activity. We show that
increasing the network connectivity the activity changes discontinuously from
zero to a finite valu... | 1995-11-11 | 2008-02-03 | [
"cond-mat",
"q-bio"
] | Albert-L\'aszl\'o Barab\'asi (Department of Physics, University of
Notre Dame, Notre Dame, IN) |
cond-mat/9511047 | Bethe-Peierls Approximation for the 2D Random Ising Model | The partition function of the 2d Ising model with random nearest neighbor
coupling is expressed in the dual lattice made of square plaquettes. The dual
model is solved in the the mean field and in different types of Bethe-Peierls
approximations, using the replica method. | 1995-11-10 | 2009-10-28 | [
"cond-mat"
] | G. Paladin and M. Serva |
cond-mat/9511048 | Quantitative Analysis of a Fracture Surface by Atomic Force Microscopy | The fracture surface of a Ti3Al-based alloy is studied using both an atomic
force microscope and a standard scanning electron microscope. Results are shown
to be quantitatively comparable. Two fracture regimes are observed. It is shown
in particular that the roughness index characterizing the small lengthscales
regime ... | 1995-11-10 | 2009-10-28 | [
"cond-mat"
] | P. Daguier, S. Henaux, E. Bouchaud, F. Creuzet |
cond-mat/9511051 | Contrasting Dynamic Spin Susceptibility Models and their Relation to
High Temperature Superconductivity | We compare the normal-state resistivities $\rho$ and the critical
temperatures $T_c$ for superconducting $d_{x^2-y^2}$ pairing due to
antiferromagnetic (AF) spin fluctuation exchange in the context of the two
phenomenological dynamical spin susceptibility models, recently proposed by
Millis, Monien, and Pines (MMP) and... | 1995-11-10 | 2009-10-28 | [
"cond-mat"
] | H.-B. Schuttler and M. R. Norman |
cond-mat/9511049 | On infrared divergences in spin glasses | By studying the structure of infrared divergences in a toy propagator in the
replica approach to the Ising spin glass below $T_c$, we suggest a possible
cancellation mechanism which could decrease the degree of singularity in the
loop expansion. | 1995-11-10 | 2009-10-28 | [
"cond-mat"
] | M. E. Ferrero and G. Parisi |
cond-mat/9511046 | Boundary Effects on Spectral Properties of Interacting Electrons in One
Dimension | The single electron Green's function of the one-dimensional
Tomonaga-Luttinger model in the presence of open boundaries is calculated with
bosonization methods. We show that the critical exponents of the local spectral
density and of the momentum distribution change in the presence of a boundary.
The well understood un... | 1995-11-10 | 2009-10-28 | [
"cond-mat"
] | Sebastian Eggert, Henrik Johannesson, Ann Mattsson (Chalmers TH,
Gothenburg) |
cond-mat/9511044 | Numerical and approximate analytical results for the frustrated spin-1/2
quantum spin chain | We study the $T=0$ frustrated phase of the $1D$ quantum spin-$\frac 12$
system with nearest-neighbour and next-nearest-neighbour isotropic exchange
known as the Majumdar-Ghosh Hamiltonian. We first apply the coupled-cluster
method of quantum many-body theory based on a spiral model state to obtain the
ground state ener... | 1995-11-09 | 2009-10-28 | [
"cond-mat",
"hep-th"
] | R. J. Bursill and G. A. Gehring (Department of Physics, University of
Sheffield), D. J. J. Farnell, J.B. Parkinson and Chen Zeng (Department of
Mathematics, UMIST), T. Xiang (IRC, University of Cambridge) |
cond-mat/9511045 | The density matrix renormalisation group and critical phenomena | We adapt White's density matrix renormalisation group (DMRG) to the direct
study of critical phenomena. We use the DMRG to generate transformations in the
space of coupling constants. We postulate that a study of density matrix
eigenvalues leads to a natural identification of renormalised blocks, operators
and Hamilton... | 1995-11-09 | 2007-05-23 | [
"cond-mat",
"hep-th"
] | R. J. Bursill and F. Gode (Department of Physics, University of
Sheffield) |
cond-mat/9511041 | On the Stereochemistry of the Cations in the Doping Block of
Superconducting Copper-Oxides | Metal-oxygen complexes containing Cu,- Tl-, Hg-, Bi- and Pb-cations are
electronically active in superconducting copper-oxides by stabilizing single
phases with enhanced $T_c$, whereas other metal-oxygen complexes deteriorate
copper-oxide superconductivity. Cu, Tl, Hg, Bi, Pb in their actual oxidation
states are closed... | 1995-11-08 | 2009-10-28 | [
"cond-mat",
"supr-con"
] | J. R\"ohler (European Synchrotron Radiation Facility, Grenoble) |
cond-mat/9511040 | Coarsening and persistence in the voter model | We investigate coarsening and persistence in the voter model by introducing
the quantity $P_n(t)$, defined as the fraction of voters who changed their
opinion n times up to time t. We show that $P_n(t)$ exhibits scaling behavior
that strongly depends on the dimension as well as on the initial opinion
concentrations. Ex... | 1995-11-08 | 2009-10-28 | [
"cond-mat"
] | E.Ben-Naim, L.Frachebourg, and P.L.Krapivsky |
cond-mat/9511039 | Stochastic Model for Surface Erosion Via Ion-Sputtering: Dynamical
Evolution from Ripple Morphology to Rough Morphology | Surfaces eroded by ion-sputtering are sometimes observed to develop
morphologies which are either ripple (periodic), or rough (non-periodic). We
introduce a discrete stochastic model that allows us to interpret these
experimental observations within a unified framework. We find that a periodic
ripple morphology charact... | 1995-11-08 | 2009-10-28 | [
"cond-mat",
"adap-org",
"mtrl-th",
"nlin.AO"
] | Rodolfo Cuerno, Hernan A. Makse, Silvina Tomassone, Stephen T.
Harrington, and H. E. Stanley |
cond-mat/9511043 | Growth and Structure of Random Fibre Clusters and Cluster Networks | We study the properties of 2D fibre clusters and networks formed by
deposition processes. We first examine the growth and scaling properties of
single clusters. We then consider a network of such clusters, whose spatial
distribution obeys some effective pair distribution function. In particular, we
derive an expression... | 1995-11-08 | 2009-10-28 | [
"cond-mat"
] | N. Provatas, T. Ala-Nissila, and M. J. Alava |
cond-mat/9511042 | Mode-Coupling Approximations, Glass Theory and Disordered Systems | We discuss the general link between mode-coupling like equations (which serve
as the basis of some recent theories of supercooled liquids) and the dynamical
equations governing mean-field spin-glass models, or the dynamics of a particle
in a random potential. The physical consequences of this interrelation are
underlin... | 1995-11-08 | 2015-06-25 | [
"cond-mat",
"hep-th"
] | Jean-Philippe Bouchaud, Leticia Cugliandolo, Jorge Kurchan and Marc
M\'ezard |
cond-mat/9511037 | Cellular Automata For Traffic Flow: Analytical Results | We use analytical methods to investigate cellular automata for traffic flow.
Two different mean-field approaches are presented, which we call site-oriented
and car-oriented, respectively. The car-oriented mean-field theory yields the
exact fundamental diagram for the model with maximum velocity $\vm =1$ whereas
in the ... | 1995-11-07 | 2007-05-23 | [
"cond-mat"
] | Andreas Schadschneider, Michael Schreckenberg |
cond-mat/9511036 | Influence of frustration on a d=3 diluted antiferromagnet:
$Fe_{x}Zn_{1-x}F_{2}$ | The influence of a frustrated bond on the magnetic properties of a d=3
uniaxial (Ising) b.c.c. diluted antiferromagnet, with emphasis in the compound
$Fe_{x}Zn_{1-x}F_{2}$, is investigated by a local mean-field numerical
simulation. In particular we find that the initial drop of the saturation
staggered magnetization (... | 1995-11-07 | 2009-10-28 | [
"cond-mat"
] | E.P. Raposo, M.D. Coutinho-Filho and F.C. Montenegro |
cond-mat/9511034 | Plaquette Resonating-Valence-Bond Ground State of CaV$_4$O$_9$ | A theoretical model is presented to explain the spin gap observed for
CaV$_4$O$_9$. The underlying lattice of the 1/5-depleted square lattice favors
a formation of plaquette resonating valence bond state. Inclusion of the
frustrating second neighbor interaction enhances this tendency, leading to a
quantum disordered st... | 1995-11-07 | 2009-10-28 | [
"cond-mat"
] | Kazuo Ueda, Hiroshi Kontani, Manfred Sigrist and Patrick A. Lee |
cond-mat/9511033 | Low-energy states for correlated-electron models in the strong-coupling
limit | We study a class of exactly solvable models for strongly correlated
electrons, defined on a set of N cells, and with infinite on-site repulsion on
part of the sites of each cell. For 2N or more electrons the exact ground state
is known. We construct a tractable (2N-1)-particle state which becomes
asymptotically degener... | 1995-11-07 | 2009-10-28 | [
"cond-mat"
] | Andreas Giesekus and Uwe Brandt |
cond-mat/9511038 | Interaction-induced delocalization of quasiparticle pairs in the
Anderson insulator | It has recently been established that a short-range interaction can strongly
delocalize a pair of particles moving in a disordered potential. We investigate
whether an analogous effect exists also for pairs of quasiparticles in the
Anderson insulator by employing an approximate numerical evaluation of the
two-particle ... | 1995-11-07 | 2007-05-23 | [
"cond-mat"
] | Felix von Oppen and Tilo Wettig |
cond-mat/9511035 | Effect of the hole doping into the Haldane-gap state on the
one-dimensional $S=1$ $t$-$J$ model | The ground state and excitation spectra of the $S=1$ Heisenberg spin chain
with hole hopping are investigated by means of the numerical-diagonalization
method and by the help of the Zhang-Arovas picture.
As for the charge sector, two phases are found. It is shown that in the
weak-hopping region, a phase separation oc... | 1995-11-07 | 2016-08-31 | [
"cond-mat"
] | Yoshihiro Nishiyama and Masuo Suzuki (University of Tokyo) |
cond-mat/9511030 | Theory of a single Oxygen hole propagating in Sr_2CuO_2Cl_2: the spin of
the quasiparticles in CuO_2 planes | Recent photoemission experiments have measured E vs. k for a single hole
propa- gating in antiferromagnetically aligned Sr_2CuO_2Cl_2. Comparisons with
(i) the t - t' - J model, for which the carrier is a spinless vacancy, and (ii)
a strong-coupling version of the three-band Emery model, for which the carrier
is a S = ... | 1995-11-06 | 2009-10-28 | [
"cond-mat"
] | K. J. E. Vos and R. J. Gooding |
cond-mat/9511027 | Thermodynamics of a d-wave Superconductor Near a Surface | We study the properties of an anisotropically paired superconductor in the
presence of a specularly reflecting surface. The bulk stable phase of the
superconducting order parameter is taken to have $d_{x^2-y^2}$ symmetry.
Contributions by order parameter components of different symmetries vanish in
the bulk, but may en... | 1995-11-06 | 2009-10-28 | [
"cond-mat"
] | L.J. Buchholtz, Mario Palumbo, D. Rainer, and J.A. Sauls |
cond-mat/9511032 | Space covering by growing rays | We study kinetic and jamming properties of a space covering process in one
dimension. The stochastic process is defined as follows: Seeds are nucleated
randomly in space and produce rays which grow with a constant velocity. The
growth stops upon collision with another ray. For arbitrary distributions of
the growth velo... | 1995-11-06 | 2009-10-28 | [
"cond-mat"
] | P.L.Krapivsky and E.Ben-Naim |
cond-mat/9511029 | Spin Gap in CaV4O9: a Large S Appraoch | We study the stability of the 4-site plaquette order in a model recently
introduced by Katoh and Imada to explain the spin gap in CaV4O9. We show that
all relevant types of order can be described within the framework of Schwinger
boson mean fiel theory, and we make predictions regarding their relative
stability. The re... | 1995-11-06 | 2008-02-03 | [
"cond-mat"
] | Marc Albrecht and Frederic Mila |
cond-mat/9511028 | The Effect of Surfaces on the Tunneling Density of States of an
Anisotropically Paired Superconductor | We present calculations of the tunneling density of states in an
anisotropically paired superconductor for two different sample geometries: a
semi-infinite system with a single specular wall, and a slab of finite
thickness and infinite lateral extent. In both cases we are interested in the
effects of surface pair break... | 1995-11-06 | 2009-10-28 | [
"cond-mat"
] | L.J. Buchholtz, Mario Palumbo, D. Rainer, and J.A. Sauls |
cond-mat/9511031 | Scaling theory of the Kondo screening cloud | A scaling form for the local susceptibility, derived from renormalization
group arguments, is proposed. The scale over which the uniform part of this
scaling form varies can be viewed as a definition of the Kondo ``screening
cloud" $\sim \xi_K$. The proposed scaling form interpolates between
Ruderman-Kittel-Kasuya-Yosi... | 1995-11-06 | 2009-10-28 | [
"cond-mat"
] | Erik Sorensen (IU Bloomington) and Ian Affleck (UBC) |
cond-mat/9511026 | Microscopic derivation of rate equations for quantum transport | It is shown that under certain conditions the resonant transport in
mesoscopic systems can be described by modified (quantum) rate equations, which
resemble the optical Bloch equations with some additional terms. Detailed
microscopic derivation from the many-body Schr\"odinger equation is presented.
Special attention i... | 1995-11-06 | 2009-10-28 | [
"cond-mat",
"quant-ph"
] | S. A. Gurvitz and Ya. S. Prager |
cond-mat/9511025 | Mean-Field Nematic--Smectic-{\sl A} Transition in a Random Polymer
Network | Liquid crystal elastomers present a rich combination of effects associated
with orientational symmetry breaking and the underlying rubber elasticity. In
this work we focus on the effect of the network on the nematic--smectic-{\sl A}
transition, exploring the additional translational symmetry breaking in these
elastomer... | 1995-11-05 | 2009-10-28 | [
"cond-mat"
] | Peter D. Olmsted (Univerisity of Michigan) and Eugene M. Terentjev
(Cavendish Laboratory, Cambridge University) |
cond-mat/9511024 | Dynamics of Inhomogeneous Tomonaga-Luttinger Liquid Wire | Dynamics of the 1D electron transport between two reservoirs are studied
based on the inhomogeneous Tomonaga- Luttinger Liquid (ITLL) model in the case
when the effect of the electron backscattering on the impurities is negligible.
The inhomogeneities of the interaction lead to a charge wave reflection. This
effect sup... | 1995-11-05 | 2015-06-25 | [
"cond-mat"
] | Vadim Ponomarenko |
cond-mat/9511023 | Kondo resonance in the case of strong Coulomb screening | The effect of Coulomb screening on the magnetic impurity behavior is
analysed. Two types of the behavior corresponding to either integer or
fractional occupation numbers of the low lying magnetic level are described.
The features in the dependence of the resistivity on the magnetic field
specific for these regimes are ... | 1995-11-05 | 2007-05-23 | [
"cond-mat"
] | Vadim Ponomarenko |
cond-mat/9511022 | The Effects of Electron-Electron Interactions on the Integer Quantum
Hall Transitions | We study the effects of electron-electron interaction on the critical
properties of the plateau transitions in the {\it integer} quantum Hall effect.
We find the renormalization group dimension associated with short-range
interactions to be $-0.66\pm0.04$. Thus the non-interacting fixed point
(characterized $z=2$ and $... | 1995-11-04 | 2009-10-28 | [
"cond-mat"
] | Dung-Hai Lee and Ziqiang Wang |
cond-mat/9511020 | A pair of interacting spins coupled to an environmental sea: dissipation
and mutual decoherence | We consider the quantum dynamics of two spin-1/2 systems, each coupled to a
bath of oscillators, so that a bath-mediated coupling is generated between the
spins. We find that the interactions destroys any coherent motion of the 2
spins, even if the coupling of each spin to the bath is quite weak, unless the
interaction... | 1995-11-03 | 2007-05-23 | [
"cond-mat"
] | M. Dube and P.C.E. Stamp |
cond-mat/9511016 | Quantum Relaxation of Magnetisation in Magnetic Particles | At temperatures below the magnetic anisotropy energy, monodomain magnetic
systems (small particles, nanomagnetic devices, etc.) must relax quantum
mechanically. This quantum relaxation must be mediated by the coupling to both
nuclear spins and phonons (and electrons if either particle or substrate is
conducting. We ana... | 1995-11-03 | 2009-10-28 | [
"cond-mat"
] | N.V. Prokof'ev and P.C.E. Stamp |
cond-mat/9511015 | Quantum Coherence in Magnetic Grains | We consider a model of the dynamics of a magnetic grain, incorporating
interactions with nuclear and paramagnetic spins, conduction electrons, and
phonons. Decoherence comes both from the spins and the electrons, although
electron effects can be neglected if the substrate is insulating, and the grain
has spin $S \le 10... | 1995-11-03 | 2007-05-23 | [
"cond-mat"
] | N. V. Prokof'ev and P. C. E. Stamp |
cond-mat/9511018 | Spectral Flow in Josephson Junctions and Effective Magnus Force | Momentum production during the phase slip process in SNS Josephson junction
is discussed. It is caused by the spectral flow of bound states of fermions
localized within the junction. This effectively reduces the Magnus force acting
on vortices which provides an explanation for the experimental observation of
the neglig... | 1995-11-03 | 2007-05-23 | [
"cond-mat",
"hep-th",
"supr-con"
] | Yu.G. Makhlin, G.E. Volovik (Low Temperature Laboratory, Helsinki
University of Technology, Espoo, Finland and L.D. Landau Institute for
Theoretical Physics, Moscow, Russia) |
cond-mat/9511019 | Ground states for a class of deterministic spin models with glassy
behaviour | We consider the deterministic model with glassy behaviour, recently
introduced by Marinari, Parisi and Ritort, with \ha\ $H=\sum_{i,j=1}^N
J_{i,j}\sigma_i\sigma_j$, where $J$ is the discrete sine Fourier transform. The
ground state found by these authors for $N$ odd and $2N+1$ prime is shown to
become asymptotically de... | 1995-11-03 | 2016-08-15 | [
"cond-mat"
] | I.Borsari, S.Graffi and F.Unguendoli (Dipartimento di Matematica,
Universit\`a di Bologna, Bologna, Italia) |
cond-mat/9511021 | Calculation of electronic properties of amorphous alloys | We describe the application of the
locally-self-consistent-multiple-scattering (LSMS)[1] method to amorphous
alloys. The LSMS algorithm is optimized for the Intel XP/S-150, a
multiple-instruction-multiple-data parallel computer with 1024 nodes and 2
compute processors per node. The electron density at each site is dete... | 1995-11-03 | 2009-10-28 | [
"cond-mat"
] | J.C. Swihart, D.M.C. Nicholson, G.M. Stocks, Y. Wang, W.A. Shelton,
and H. Yang |
cond-mat/9511017 | Charged particles in random magnetic fields and the critical behavior in
the fractional quantum Hall effect | As a model for the transitions between plateaus in the fractional Quantum
Hall effect we study the critical behavior of non-interacting charged particles
in a static random magnetic field with finite mean value. We argue that this
model belongs to the same universality class as the integer Quantum Hall
effect. The univ... | 1995-11-03 | 2009-10-28 | [
"cond-mat"
] | Bodo Huckestein |
cond-mat/9511009 | Decoherence in the Spin Bath | We develop a mathematical description of the decoherence caused by "spin
baths", such as nuclear spins or magnetic impurities. In contrast to the usual
oscillator bath models of quantum environments, decoherence in the spin bath
can occur without any dissipation. Given the almost ubiquitous presence of
nuclear spins in... | 1995-11-02 | 2007-05-23 | [
"cond-mat"
] | N. V. Prokof'ev and P. C. E. Stamp |
cond-mat/9511007 | Anomalous diffusion in the presence of external forces: exact
time-dependent solutions and entropy | The optimization of the usual entropy $S_1[p]=-\int du p(u) ln p(u)$ under
appropriate constraints is closely related to the Gaussian form of the exact
time-dependent solution of the Fokker-Planck equation describing an important
class of normal diffusions. We show here that the optimization of the
generalized entropic... | 1995-11-02 | 2009-10-28 | [
"cond-mat"
] | Constantino Tsallis and Dirk Jan Bukman |
cond-mat/9511014 | Berry phase, hyperorbits, and the Hofstadter spectrum: semiclassical
dynamics in magnetic Bloch bands | We have derived a new set of semiclassical equations for electrons in
magnetic Bloch bands. The velocity and energy of magnetic Bloch electrons are
found to be modified by the Berry phase and magnetization. This semiclassical
approach is used to study general electron transport in a DC or AC electric
field. We also fin... | 1995-11-02 | 2009-10-28 | [
"cond-mat"
] | M.C.Chang and Q.Niu |
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