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/9507142 | Phonon `notches' in a-b -plane optical conductivity of high-Tc
superconductors | It is shown that a correlation between the positions of the $c$-axis
longitudinal optic ($LO_c$) phonons and ``notch''-like structures in the
$a$-$b$ plane conductivity of high-$T_c$ superconductors results from
phonon-mediated interaction between electrons in different layers. It is found
that the relative size of the... | 1995-08-01 | 2009-10-28 | [
"cond-mat"
] | Vladimir N. Kostur (University of Maryland) |
cond-mat/9508005 | The Spin Stiffness and the Transverse Susceptibility of the Half-filled
Hubbard Model | The $T=0$ spin stiffness $\rho _{s}$ and the transverse susceptibility $\chi
_{\perp }$ of the square lattice half-filled Hubbard model are calculated as a
function of the Hubbard parameter ratio $U/t$ by series expansions around the
Ising limit. We find that the calculated spin-stiffness, transverse
susceptibility, an... | 1995-08-01 | 2009-10-28 | [
"cond-mat"
] | Zhu-Pei Shi and Rajiv R. P. Singh |
cond-mat/9508001 | Crossover of a nonequilibrium system studied by coherent anomaly method | In the stochastic cellular automaton of rule 18 defined by S. Wolfram [Rev.\
Mod.\ Phys.\ {\bf 55}, 601 (1983)] the crossover of the critical behaviour
induced by nonlocal site exchange was investigated using the coherent anomaly
method. The continuous variation of the critical $\beta$ exponent was
confirmed. | 1995-08-01 | 2007-05-23 | [
"cond-mat"
] | G\'eza \'Odor |
cond-mat/9508002 | Numerical evidence for the spin-Peierls state in the frustrated quantum
antiferromagnet | We study the spin-$1\over2$ Heisenberg antiferromagnet with an
antiferromagnetic $J_3$ (third nearest neighbor) interaction on a square
lattice. We numerically diagonalize this ``$J_1$-$J_3$'' model on clusters up
to 32-sites and search for novel ground state properties as the frustration
parameter $J_3/J_1$ changes. F... | 1995-08-01 | 2009-10-28 | [
"cond-mat"
] | P. W. Leung and Ngar-wing Lam (Hong Kong University of Science and
Technology) |
cond-mat/9508006 | There are No Nice Interfaces in 2+1 Dimensional SOS-Models in Random
Media | We prove that in dimension $d\leq 2$ translation covariant Gibbs states
describing rigid interfaces in a disordered solid-on-solid (SOS) cannot exist
for any value of the temperature, in contrast to the situation in $d\geq 3$.
The prove relies on an adaptation of a theorem of Aizenman and Wehr.
Keywords: Disordered s... | 1995-08-01 | 2009-10-28 | [
"cond-mat"
] | Anton Bovier, Christof Kulske |
cond-mat/9508004 | Analytical solution of the Monte Carlo dynamics of a simple spin-glass
model | In this note we present an exact solution of the Monte Carlo dynamics of the
spherical Sherrington-Kirkpatrick spin-glass model. We obtain the dynamical
equations for a generalized set of moments which can be exactly closed. Only in
a certain particular limit the dynamical equation of the energy coincides with
that of ... | 1995-08-01 | 2009-10-28 | [
"cond-mat"
] | L. L. Bonilla, F. G. Padilla, G. Parisi and F. Ritort |
cond-mat/9508008 | Critical Properties of the Calogero-Sutherland Model with Boundaries | Critical properties of the Calogero-Sutherland model of $BC_N$-type
($BC_N$-CS model) are studied. Using the asymptotic Bethe-ansatz spectrum of
the $BC_N$-CS model, we calculate finite-size corrections in the energy
spectrum. Since the $BC_N$-CS model does not possess translational invariance,
the finite-size spectrum... | 1995-08-01 | 2009-10-28 | [
"cond-mat",
"hep-th"
] | Takashi Yamamoto, Norio Kawakami, Sung-Kil Yang |
cond-mat/9507138 | Series Expansions for Excited States of Quantum Lattice Models | We show that by means of connected-graph expansions one can effectively
generate exact high-order series expansions which are informative of low-lying
excited states for quantum many-body systems defined on a lattice. In
particular, the Fourier series coefficients of elementary excitation spectra
are directly obtained.... | 1995-07-31 | 2009-10-28 | [
"cond-mat"
] | Martin P. Gelfand (Colorado State University) |
cond-mat/9507139 | Superconducting Upper Critical Field Near a 2D Van Hove Singularity | The superconducting upper critical field $H_{c2}(T)$ of a two dimensional BCS
superconductor is calculated in the vicinity of a van-Hove singularity. The
zero temperature upper critical field is strongly enhanced at weak coupling
when the Fermi contour coincides with van-Hove points, scaling as $H_{c2}(0)
\propto T_c^{... | 1995-07-31 | 2009-10-28 | [
"cond-mat"
] | R. G. Dias and J. M. Wheatley |
cond-mat/9507143 | Spin-$S$ generalization of fractional exclusion statistics | We study fractional exclusion statistics for quantum systems with SU(2)
symmetry (arbitrary spin $S$), by generalizing the thermodynamic equations with
squeezed strings proposed by Ha and Haldane. The bare hole distributions as
well as the statistical interaction defined by an infinite-dimensional matrix
specify the un... | 1995-07-31 | 2009-10-28 | [
"cond-mat"
] | T. Fukui, N. Kawakami and S.-K. Yang |
cond-mat/9507134 | Variational Approach to the Dilute Bose Gas | We study the weakly-interacting Bose gas in both two and three dimensions
using a variational approach. In particular we construct the thermodynamic
potential of the gas to within ladder approximation and find by minimization an
accurate mean-field description of the dilute Bose gas. Using spin-polarized
atomic hydroge... | 1995-07-31 | 2007-05-23 | [
"cond-mat"
] | M. Bijlsma and H.T.C. Stoof |
cond-mat/9507137 | Numerical Simulations of the Random Phase Sine Gordon Model | We have performed comprehensive numerical simulations of the Random Phase
Sine Gordon Model, studying both statics and dynamics for various values of the
coupling. The glass transition can be seen both in static and dynamic signals
at a temperature that depends on the coupling. Our results agree qualitatively
(statics)... | 1995-07-31 | 2009-10-28 | [
"cond-mat"
] | David J. Lancaster and Juan J. Ruiz Lorenzo |
cond-mat/9507141 | Solution of a One-Dimensional Reaction-Diffusion Model with Spatial
Asymmetry | We study classical particles on the sites of an open chain which diffuse,
coagulate and decoagulate preferentially in one direction. The master equation
is expressed in terms of a spin one-half Hamiltonian $H$ and the model is shown
to be completely solvable if all processes have the same asymmetry. The
relaxational sp... | 1995-07-31 | 2015-06-25 | [
"cond-mat"
] | Haye Hinrichsen, Klaus Krebs and Ingo Peschel |
cond-mat/9507140 | Density-Dependent Squeezing of Excitons in Highly Excited Semiconductors | The time evolution from coherent states to squeezed states of high density
excitons is studied theoretically based on the boson formalism and within the
Random Phase Approximation. Both the mutual interaction between excitons and
the anharmonic exciton-photon interaction due to phase-space filling of
excitons are inclu... | 1995-07-31 | 2007-05-23 | [
"cond-mat"
] | Nguyen Hong Quang (N.H.Quang) |
cond-mat/9507136 | Magnetotransport with two occupied subbands in a Si(100) inversion layer | We have studied an electron transport in inversion layers of high-mobility
Si(100) samples. At high electron concentrations and temperatures below 4.2 K,
two series of Shubnikov-de Haas oscillations have been observed. The
temperature damping of the second series oscillations indicates that the second
occupied subband ... | 1995-07-31 | 2009-10-28 | [
"cond-mat"
] | S. G. Semenchinsky, L. Smrcka, and J. Stehno |
cond-mat/9508062 | Quantum Theory of Large Systems of Non-Relativistic Matter | 1. Introduction
2. The Pauli Equation and its Symmetries {2.1} Gauge-Invariant Form of the
Pauli Equation {2.2} Aharonov-Bohm Effect {2.3} Aharonov-Casher Effect
3. Gauge Invariance in Non-Relativistic Quantum Many-Particle Systems {3.1}
Differential Geometry of the Background {3.2} Systems of Spinning Particles
Co... | 1995-07-31 | 2016-08-31 | [
"cond-mat",
"hep-th",
"quant-ph"
] | J. Froehlich, U.M. Studer and E. Thiran |
cond-mat/9507135 | Non-Universal Behavior of Finite Quantum Hall Systems as a Result of
Weak Macroscopic Inhomogeneities | We show that, at low temperatures, macroscopic inhomogeneities of the
electron density in the interior of a finite sample cause a reduction in the
measured conductivity peak heights $\sigma_{xx}^{\rm max}$ compared to the
universal values previously predicted for infinite homogeneous samples. This
effect is expected to... | 1995-07-31 | 2009-10-28 | [
"cond-mat"
] | I. M. Ruzin, N. R. Cooper, and B. I. Halperin |
cond-mat/9507131 | Valence band structure, edge states and interband absorption in Quantum
Well Wires in high magnetic fields | We present a theoretical study of the magnetic band structure of conduction
and valence states in Quantum Well Wires in high magnetic fields. We show that
hole mixing results in a very complex behavior of valence edge states with
respect to conduction states, a fact which is likely to be important in
magneto-transport ... | 1995-07-30 | 2009-10-28 | [
"cond-mat"
] | G.Goldoni and A.Fasolino |
cond-mat/9507132 | Does Fully-Developed Turbulence Exist? Reynolds Number Independence
versus Asymptotic Covariance | By analogy with recent arguments concerning the mean velocity profile of
wall-bounded turbulent shear flows, we suggest that there may exist corrections
to the 2/3 law of Kolmogorov, which are proportional to $(\ln\,\Re)^{-1}$ at
large Re. Such corrections to K41 are the only ones permitted if one insists
that the func... | 1995-07-30 | 2009-10-28 | [
"cond-mat",
"chao-dyn",
"hep-th",
"nlin.CD"
] | G.I. Barenblatt and Nigel Goldenfeld (University of Illinois at
Urbana-Champaign) |
cond-mat/9507133 | Occupation numbers in density-functional calculations | It is the intention of this paper to rigorously clarify the role of the
occupation numbers in the current practical applications of the density
functional formalism. In these calculations one has to decide how to distribute
a given, fixed number of electrons over a set of single-particle orbitals. The
conventional choi... | 1995-07-30 | 2009-10-28 | [
"cond-mat",
"chem-ph",
"mtrl-th"
] | M.M. Valiev and G.W. Fernando |
cond-mat/9507130 | Numerical Results for the Ground-State Interface in a Random Medium | The problem of determining the ground state of a $d$-dimensional interface
embedded in a $(d+1)$-dimensional random medium is treated numerically. Using a
minimum-cut algorithm, the exact ground states can be found for a number of
problems for which other numerical methods are inexact and slow. In particular,
results a... | 1995-07-29 | 2009-10-28 | [
"cond-mat"
] | A. Alan Middleton (Syracuse University) |
cond-mat/9507129 | Phase Diagram of the Spin-One Heisenberg System with Dimerization and
Frustration | We use the density matrix renormalization group method to study the ground
state properties of an antiferromagnetic spin-$1$ chain with a next-nearest
neighbor exchange $J_2 ~$ and an alternation $\delta$ of the nearest neighbor
exchanges. We find a line running from a gapless point at $(J_2 , \delta) = (0,
0.25 \pm 0.... | 1995-07-29 | 2009-10-28 | [
"cond-mat"
] | Swapan Pati, R. Chitra, Diptiman Sen, H. R. Krishnamurthy and S.
Ramasesha (Indian Institute of Science, Bangalore) |
cond-mat/9507126 | Effects of Geometric Phases in Josephson Junction Arrays | We show that the en route vortex velocity dependent part of the Magnus force
in a Josephson junction array is effectively zero, and predict zero Hall effect
in the classical limit. However, geometric phases due to the finite superfluid
density at superconductor grains have a profound influence on the quantum
dynamics o... | 1995-07-28 | 2009-10-28 | [
"cond-mat"
] | X.-M. Zhu, Yong Tan, P. Ao |
cond-mat/9507128 | Quantum Mechanics Simulated as Branching Process | Diffusion processes with branching play an important role in statistical
dynamics. They are a common approach to the computing of quantum mechanical
groundstates, and serve as models for population dynamics and as physical
pictures for biological evolution.
On a computer the efficiency of this simulation method is li... | 1995-07-28 | 2008-02-03 | [
"cond-mat"
] | Thomas Fricke |
cond-mat/9507127 | Avoided Critical Behavior in a Uniformly Frustrated System | We study the effects of weak long-ranged antiferromagnetic interactions of
strength $Q$ on a spin model with predominant short-ranged ferromagnetic
interactions. In three dimensions, this model exhibits an avoided critical
point in the sense that the critical temperature $T_c(Q=0)$ is strictly greater
than $\lim_{Q\to ... | 1995-07-28 | 2015-06-25 | [
"cond-mat"
] | L. Chayes, V. J. Emery, S. A. Kivelson, Z. Nussinov, and G. Tarjus |
cond-mat/9507123 | Discontinuous Interface Depinning from a Rough Wall | Depinning of an interface from a random self--affine substrate with roughness
exponent $\zeta_S$ is studied in systems with short--range interactions. In
2$D$ transfer matrix results show that for $\zeta_S<1/2$ depinning falls in the
universality class of the flat case. When $\zeta_S$ exceeds the roughness
($\zeta_0=1/... | 1995-07-27 | 2009-10-28 | [
"cond-mat"
] | G. Giugliarelli and A.L. Stella (Dipartimento di Fisica, Universit\'a
di Udine, Italy) |
cond-mat/9507121 | Exact Critical Exponents for Pseudo-Particles in the Kondo Problem | Exact critical exponents of the Green functions for pseudo-fermions and slave
bosons in the SU($N$) Anderson model with $U\rightarrow\infty$ are obtained by
using the Bethe ansatz solution and boundary conformal field theory. They are
evaluated exactly for mixed valence systems and Kondo systems with crystalline
fields... | 1995-07-27 | 2009-10-28 | [
"cond-mat"
] | S. Fujimoto, N. Kawakami, and S.-K. Yang |
cond-mat/9507122 | Canonical Phase Diagrams of the 1-D Falicov-Kimball Model at T=0 | The Falicov-Kimball model of spinless quantum electrons hopping on a
1-dimensional lattice and of immobile classical ions occupying some lattice
sites, with only intrasite coupling between those particles, have been studied
at zero temperature by means of well-controlled numerical procedures. For
selected values of the... | 1995-07-27 | 2015-06-25 | [
"cond-mat"
] | Z. Gajek, J. Jedrzejewski and R. Lemanski |
cond-mat/9507124 | Intercalation and Staging Behavior in Super-Oxygenated $La_2CuO_{4 +
\delta}$ | A high temperature electrochemical oxidation process has been used to produce
large single crystals of $La_2CuO_{4 + \delta}$ suitable for neutron scattering
experiments. Below room temperature the oxygen-rich phases have structural
superlattice scattering peaks which indicate new periodicities ranging from 2
to 6.6 la... | 1995-07-27 | 2010-11-17 | [
"cond-mat",
"supr-con"
] | B.O. Wells, R.J. Birgeneau, F.C. Chou, Y. Endoh, D.C. Johnston, M.A.
Kastner, Y.S. Lee, G. Shirane, J.M. Tranquada, and K. Yamada |
cond-mat/9507125 | Novel Finite Temperature Conductivity in Quantum Hall Systems | We study quantum Hall systems (mainly the integer case) at finite
temperatures and show that there is a novel temperature dependence even for a
pure system, thanks to the `anomalous' nature of generators of translation. The
deviation of Hall conductivity from its zero temperature value is controlled by
a parameter $T_0... | 1995-07-27 | 2007-05-23 | [
"cond-mat"
] | Sudhansu S. Mandal, S. Ramaswamy, and V. Ravishankar |
cond-mat/9507119 | Transport through Dirty Luttinger Liquids Connected to Reservoirs | It is shown that the conductance of a weakly disordered Luttinger-liquid
quantum wire connected to non-interacting leads is affected by
electron-electron interactions in the wire. This is in contrast to the case of
a perfect wire the conductance of which is given by $e^2/h$ regardless of
interactions in the wire. The d... | 1995-07-26 | 2009-10-28 | [
"cond-mat"
] | Dmitrii L. Maslov (UIUC) |
cond-mat/9507120 | Complex-Temperature Properties of the 2D Ising Model for Nonzero
Magnetic Field | We study the complex-temperature phase diagram of the square-lattice Ising
model for nonzero external magnetic field $H$, i.e. for $0 \le \mu \le \infty$,
where $\mu=e^{-2\beta H}$. We also carry out a similar analysis for $-\infty
\le \mu \le 0$. The results for the interval $-1 \le \mu \le 1$ provide a new
way of con... | 1995-07-26 | 2016-08-31 | [
"cond-mat",
"hep-lat"
] | Victor Matveev and Robert Shrock |
cond-mat/9507115 | Real Space Renormalization Group Methods and Quantum Groups | We apply real-space RG methods to study two quantum group invariant
Hamiltonians, that of the XXZ model and the Ising model in a transverse field
defined in an open chain with appropiate boundary terms. The quantum group
symmetry is preserved under the RG transformation except for the appearence of
a quantum group anom... | 1995-07-26 | 2008-11-26 | [
"cond-mat",
"hep-th",
"math.QA",
"q-alg"
] | Miguel A. Martin-Delgado and German Sierra |
cond-mat/9507117 | Statistics of S-matrix poles in Few-Channel Chaotic Scattering:
Crossover from Isolated to Overlapping Resonances | We derive the explicit expression for the distribution of resonance widths in
a chaotic quantum system coupled to continua via M equivalent open channels. It
describes a crossover from the $\chi^2$ distribution (regime of isolated
resonances) to a broad power-like distribution typical for the regime of
overlapping reso... | 1995-07-26 | 2009-10-28 | [
"cond-mat",
"chao-dyn",
"nlin.CD",
"nucl-th"
] | Yan V. Fyodorov and H.-J. Sommers |
cond-mat/9507114 | Quantum fluctuations and glassy behavior: The case of a quantum particle
in a random potential | In this paper we expand our previous investigation of a quantum particle
subject to the action of a random potential plus a fixed harmonic potential at
a finite temperature T. In the classical limit the system reduces to a
well-known ``toy'' model for an interface in a random medium. It also applies
to a single quantum... | 1995-07-26 | 2009-10-28 | [
"cond-mat"
] | Yadin Y. Goldschmidt (University of Pittsburgh) |
cond-mat/9507118 | Hysteresis, Avalanches, and Disorder Induced Critical Scaling: A
Renormalization Group Approach | We study the zero temperature random field Ising model as a model for noise
and avalanches in hysteretic systems. Tuning the amount of disorder in the
system, we find an ordinary critical point with avalanches on all length
scales. Using a mapping to the pure Ising model, we Borel sum the $6-\epsilon$
expansion to $O(\... | 1995-07-26 | 2009-10-28 | [
"cond-mat"
] | Karin Dahmen and James P. Sethna |
cond-mat/9507116 | Hysteresis in the Mott Transition between Plasma and Insulating Gas | We show that hysteresis can occur in the transition between a neutral plasma
and the insulating gas consisting of neutral pairs bound by Coulomb attraction.
Since the transition depends sensitively on the screening length in the plasma,
regions of bistability occur in density--temperature phase space. We present
numeri... | 1995-07-26 | 2009-10-28 | [
"cond-mat",
"nlin.PS",
"patt-sol"
] | D.W. Snoke and J.D. Crawford (Department of Physics and Astronomy,
University of Pittsburgh, Pittsburgh, PA) |
cond-mat/9507105 | Current fluctuations in a single tunnel junction | We study noise spectra of currents through a tunnel junction in weak
tunneling limit. We introduce effective capacitance to take into account the
interaction effect and explicitly incorporate the electromagnetic environment
of the junction into the formulation. We study the effect of charging energy
and macroscopic env... | 1995-07-25 | 2008-04-12 | [
"cond-mat"
] | Hyunwoo Lee and L. S. Levitov (MIT) |
cond-mat/9507107 | Two interacting particles in an effective 2-3d random potential | We study the effect of coherent propagation of two interacting particles in
an effective 2-3-d disordered potential. Our numerical data demonstrate that in
dimension $d > 2$, interaction can lead to two--particles delocalization below
one--particle delocalization border. We also find that the distance between the
two d... | 1995-07-25 | 2009-10-28 | [
"cond-mat"
] | Fausto Borgonovi and Dima Shepelyansky |
cond-mat/9507113 | Quantum Hall Effect: Current Distribution and the Role of Measurement | Based on very general arguments we show that for any geometry of the
experiment, in the regime when the measurement leads to a quantized Hall
conductivity, almost the entire current injected into the sample is carried by
the bulk states. The crucial role of the contacts equilibrating different edge
channels is emphasiz... | 1995-07-25 | 2007-05-23 | [
"cond-mat"
] | K. Tsemekhman, V. Tsemekhman, C. Wexler, D. J. Thouless (University of
Washington) |
cond-mat/9507108 | Order-Parameter Flow in the SK Spin-Glass II: Inclusion of Microscopic
Memory Effects | We develop further a recent dynamical replica theory to describe the dynamics
of the Sherrington-Kirkpatrick spin-glass in terms of closed evolution
equations for macroscopic order parameters. We show how microscopic memory
effects can be included in the formalism through the introduction of a dynamic
order parameter f... | 1995-07-25 | 2009-10-28 | [
"cond-mat"
] | S.N. Laughton, A.C.C. Coolen, D. Sherrington |
cond-mat/9507112 | Matrix generalizations of some dynamic field theories | We introduce matrix generalizations of the Navier--Stokes (NS) equation for
fluid flow, and the Kardar--Parisi--Zhang (KPZ) equation for interface growth.
The underlying field, velocity for the NS equation, or the height in the case
of KPZ, is promoted to a matrix that transforms as the adjoint representation
of $SU(N)... | 1995-07-25 | 2009-10-28 | [
"cond-mat",
"hep-th"
] | M. Kardar, A. Zee |
cond-mat/9507111 | The Retrieval Phase of the Hopfield Model: A Rigorous Analysis of the
Overlap Distribution | Standard large deviation estimates or the use of the Hubbard-Stratonovich
transformation reduce the analysis of the distribution of the overlap
parameters essentially to that of an explicitly known random function
$\Phi_{N,\b}$ on $\R^M$. In this article we present a rather careful study of
the structure of the minima ... | 1995-07-25 | 2007-05-23 | [
"cond-mat"
] | Anton Bovier (WIAS-Berlin), V\'eronique Gayrard (CPT-Marseille) |
cond-mat/9507110 | Singular quasiparticle scattering in the proximity of charge
instabilities | We analyze the behavior of the dynamic scattering amplitude between Fermi
liquid quasiparticles at the Fermi surface in the proximity of a charge
instability, which may occur in the high temperature superconducting cuprates.
Within the infinite-U Hubbard-Holstein model in the slave-boson large-N
technique we find that,... | 1995-07-25 | 2009-10-28 | [
"cond-mat"
] | C. Castellani, C. Di Castro, and M. Grilli |
cond-mat/9507106 | Hydrodynamics and Nonlocal Conductivities in Vortex States of Type II
Superconductors | A hydrodynamical description for vortex states in type II superconductors is
presented based on the time-dependent Ginzburg-Landau equation (TDGL). In
contrast to the familiar extension of a single vortex dynamics based on the
force balance, our description is consistent with the known hydrodynamics of a
rotating neutr... | 1995-07-25 | 2009-10-28 | [
"cond-mat"
] | Ryusuke Ikeda (Dept. of Phys., Kyoto Univ., Japan) |
cond-mat/9507109 | Interplay of Orbital Degeneracy and Superconductivity in a Molecular
Conductor | We study electron propagation in a molecular lattice model. Each molecular
site involves doubly degenerate electronic states coupled to doubly degenerate
molecular vibration, leading to a so--called E-e type of Jahn-Teller
Hamiltonian. For weak electron-phonon coupling and in the anti-adiabatic limit
we find that the o... | 1995-07-25 | 2009-10-28 | [
"cond-mat"
] | Michele Fabrizio, Marco Airoldi and Erio Tosatti |
cond-mat/9507097 | Double Degeneracy and Jahn-Teller Effects in CMR Perovskites | Jahn-Teller (JT) electron-phonon coupling effects in the colossal
magnetoresistance perovskite compounds $La_{1-x}A_xMnO_3$ are investigated.
Electron-electron correlations between two degenerate Mn $e_g$ orbitals are
studied in the Gutzwiller approximation. The static JT distortion and
antiadiabatic polaron effects ar... | 1995-07-24 | 2009-10-28 | [
"cond-mat"
] | Jun Zang, A. R. Bishop, and H. Roder (Los Alamos National Laboratory) |
cond-mat/9507104 | Prediction of an undimerized, insulating, antiferromagnetic ground-state
in halogen-bridged linear-chain Ni compounds | A parameter-free, mean-field, multi-orbital Hubbard model with nonspherical
Coulomb and exchange interactions, implemented around all-electron
local-density approximation (LDA) calculations, correctly predicts the band-gap
energy, the absence of dimerization, and the antiferromagnetic ground state of
halogen-bridged li... | 1995-07-24 | 2009-10-28 | [
"cond-mat",
"mtrl-th"
] | V.I. Anisimov, R.C. Albers, J.M. Wills, M. Alouani and J.W. Wilkins |
cond-mat/9507100 | Physical nature of critical wave functions in Fibonacci systems | We report on a new class of critical states in the energy spectrum of general
Fibonacci systems. By introducing a transfer matrix renormalization technique,
we prove that the charge distribution of these states spreads over the whole
system, showing transport properties characteristic of electronic extended
states. Our... | 1995-07-24 | 2009-10-28 | [
"cond-mat"
] | Enrique Macia and Francisco Dominguez-Adame (U. Complutense) |
cond-mat/9507101 | Dynamical Replica Theory for Disordered Spin Systems | We present a new method to solve the dynamics of disordered spin systems on
finite time-scales. It involves a closed driven diffusion equation for the
joint spin-field distribution, with time-dependent coefficients described by a
dynamical replica theory which, in the case of detailed balance, incorporates
equilibrium ... | 1995-07-24 | 2009-10-28 | [
"cond-mat"
] | A.C.C. Coolen, S.N. Laughton, D. Sherrington |
cond-mat/9507098 | A novel intermediate phase in S=2 antiferromagnetic chains with uniaxial
anisotropy | We study ground state properties of the $S=2$ quantum antiferromagnetic chain
with a uniaxially anisotropic Hamiltonian: $ H = \sum_{j} [S_{j} \cdot S_{j+1}
+ D (S^{z}_{j})^2 ] $ by a Monte Carlo calculation. While it has been reported
that a string order parameter vanishes exponentially at the isotropic
Heisenberg poi... | 1995-07-24 | 2016-08-31 | [
"cond-mat"
] | M. Oshikawa, M. Yamanaka and S. Miyashita |
cond-mat/9507103 | Continuum quantum ferromagnets at finite temperature and the Quantum
Hall effect | We study finite temperature ($T$) properties of the continuum quantum field
theory of systems with a ferromagnetic ground state. A scaling theory of the
$T=0$ system is discussed carefully, and its consequences for crossovers
between different finite $T$ regimes in dimensions 1, 2, and 3 are described.
The results are ... | 1995-07-24 | 2009-10-28 | [
"cond-mat"
] | N. Read and Subir Sachdev (Yale University) |
cond-mat/9507102 | Statistics Of The Burst Model At Super-critical Phase | We investigate the statistics of a model of type-I X-ray burst [Phys. Rev. E,
{\bf 51}, 3045 (1995)] in its super-critical phase. The time evolution of the
burnable clusters, places where fire can pass through, is studied using simple
statistical arguments. We offer a simple picture for the time evolution of the
percen... | 1995-07-24 | 2015-06-25 | [
"cond-mat",
"adap-org",
"nlin.AO"
] | T.C. Chan (Dept of Phys, Univ of Hong Kong), H.F. Chau (IAS), and K.S.
Cheng (Dept of Phys, Univ of Hong Kong) |
cond-mat/9507099 | Thermal Equilibrium with the Wiener Potential: Testing the Replica
Variational Approximation | We consider the statistical mechanics of a classical particle in a
one-dimensional box subjected to a random potential which constitutes a Wiener
process on the coordinate axis. The distribution of the free energy and all
correlation functions of the Gibbs states may be calculated exactly as a
function of the box lengt... | 1995-07-24 | 2009-10-28 | [
"cond-mat"
] | Kurt Broderix and Reiner Kree (Institut f\"ur Theoretische Physik,
Georg-August-Universit\"at, G\"ottingen, Germany) |
cond-mat/9507096 | Ising Expansion for the Hubbard Model | We develop series expansions for the ground state properties of the Hubbard
model, by introducing an Ising anisotropy into the Hamiltonian. For the
two-dimensional (2D) square lattice half-filled Hubbard model, the ground state
energy, local moment, sublattice magnetization, uniform magnetic susceptibility
and spin sti... | 1995-07-22 | 2009-10-28 | [
"cond-mat"
] | Zhu-Pei Shi and Rajiv R. P. Singh |
cond-mat/9507088 | Solid-to-solid isostructural transition in the hard sphere/attractive
Yukawa system | A thermodynamically consistent density functional-perturbation theory is used
to study the isostructural solid-to-solid transition which takes place in the
hard sphere/attractive Yukawa system when the Yukawa tail is sufficiently
short-ranged. A comparison with results for the square well potential allows us
to study t... | 1995-07-21 | 2009-10-28 | [
"cond-mat",
"chem-ph"
] | C.Rascon, L.Mederos and G.Navascues (Universidad Autonoma De Madrid /
Instituto De Ciencia De Materiales-CSIC) |
cond-mat/9507091 | Statistics of pre-localized states in disordered conductors | The distribution function of local amplitudes of single-particle states in
disordered conductors is calculated on the basis of the supersymmetric
$\sigma$-model approach using a saddle-point solution of its reduced version.
Although the distribution of relatively small amplitudes can be approximated by
the universal Po... | 1995-07-21 | 2009-10-28 | [
"cond-mat"
] | Vladimir I. Fal'ko and K. Efetov (MPI-FKF and MPI-PKS, Stuttgart) |
cond-mat/9507087 | Corner Transfer Matrix Renormalization Group Method | We propose a new fast numerical renormalization group method,the corner
transfer matrix renormalization group (CTMRG) method, which is based on a
unified scheme of Baxter's corner transfer matrix method and White's density
matrix renormalization groupmethod. The key point is that a product of four
corner transfer matri... | 1995-07-21 | 2009-10-28 | [
"cond-mat"
] | T. Nishino and K. Okunishi |
cond-mat/9507092 | Theory of the critical state of low-dimensional spin glass | We analyse the critical region of finite-($d$)-dimensional Ising spin glass,
in particular the limit of $d$ closely above the lower critical dimension
$d_\ell$. At criticality the thermally active degrees of freedom are surfaces
(of width zero) enclosing clusters of spins that may reverse with respect to
their environm... | 1995-07-21 | 2009-10-28 | [
"cond-mat"
] | M.J. Thill and H.J. Hilhorst |
cond-mat/9507086 | Integer Quantum Hall Effect with Realistic Boundary Condition : Exact
Quantization and Breakdown | A theory of integer quantum Hall effect(QHE) in realistic systems based on
von Neumann lattice is presented. We show that the momentum representation is
quite useful and that the quantum Hall regime(QHR), which is defined by the
propagator in the momentum representation, is realized. In QHR, the Hall
conductance is giv... | 1995-07-21 | 2009-10-28 | [
"cond-mat"
] | K. Ishikawa, N. Maeda, and K. Tadaki |
cond-mat/9507095 | Comment on ``Quantitative Model for the Superconductivity Suppression in
R$_{1-x}$Pr$_x$Ba$_2$Cu$_3$O$_7$ with Different Rare Earths'' | We argue that an effective single-particle model to explain the destructive
role of Pr on superconductivity in PrBa$_2$Cu$_3$O$_7$, is inconsistent with
the experimental ac conductivity in that compound. | 1995-07-21 | 2007-05-23 | [
"cond-mat",
"supr-con"
] | R. Fehrenbacher and T. M. Rice |
cond-mat/9507089 | Is there a renormalization of the 1D conductance in Luttinger Liquid
model? | Properties of 1D transport strongly depend on the proper choice of boundary
conditions. It has been frequently stated that the Luttinger Liquid (LL)
conductance is renormalized by the interaction as $g \frac{e^2} {h} $. To
contest this result I develop a model of 1D LL wire with the interaction
switching off at the inf... | 1995-07-21 | 2009-10-28 | [
"cond-mat"
] | V. Ponomarenko (RIKEN) |
cond-mat/9507090 | Kondo Resonance in Transport Properties of Double Barrier Structure | I consider the effect of the finite width of the resonant level on its
thermodynamics and tunneling transport properties in the single electron
charging regime. The finite width of the levels results from their
delocalization with formation of a narrow band due to their mutual overlap.
Making use of $1/N$ technique one... | 1995-07-21 | 2008-02-03 | [
"cond-mat"
] | V. Ponomarenko (RIKEN) |
cond-mat/9507094 | Invaded cluster algorithm for equilibrium critical points | A new cluster algorithm based on invasion percolation is described. The
algorithm samples the critical point of a spin system without a priori
knowledge of the critical temperature and provides an efficient way to
determine the critical temperature and other observables in the critical
region. The method is illustrated... | 1995-07-21 | 2009-10-28 | [
"cond-mat",
"hep-lat"
] | J. Machta, Y. S. Choi, A. Lucke and T. Schweizer (U. Mass) and L. V.
Chayes (UCLA) |
cond-mat/9507093 | Elasticity of Semiflexible Biopolymer Networks | We develop a model for gels and entangled solutions of semiflexible
biopolymers such as F-actin. Such networks play a crucial structural role in
the cytoskeleton of cells. We show that the rheologic properties of these
networks can result from nonclassical rubber elasticity. This model can explain
a number of elastic p... | 1995-07-21 | 2009-10-28 | [
"cond-mat",
"q-bio"
] | F.C. MacKintosh, J. Kas, and P.A. Janmey |
cond-mat/9507083 | Random Exchange Quantum Heisenberg Chains | The one-dimensional quantum Heisenberg model with random $\pm J$ bonds is
studied for $S=\frac{1}{2}$ and $S=1$. The specific heat and the zero-field
susceptibility are calculated by using high-temperature series expansions and
quantum transfer matrix method. The susceptibility shows a Curie-like
temperature dependence... | 1995-07-20 | 2009-10-28 | [
"cond-mat"
] | A. Furusaki, M. Sigrist, E. Westerberg, P.A. Lee, K.B. Tanaka, and N.
Nagaosa |
cond-mat/9507084 | Dynamic Jahn-Teller Effect and Colossal Magnetoresistance in
$La_{1-x}A_xMnO_3$ | A model for $La_{1-x}Sr_xMnO_3$ which incorporates the physics of dynamic
Jahn-Teller and double-exchange effects is presented and solved via a dynamical
mean field approximation. In an intermediate coupling regime the interplay of
these two effects is found to reproduce the behavior of the resistivity and
magnetic tra... | 1995-07-20 | 2009-10-28 | [
"cond-mat"
] | A. J. Millis, Boris I. Shraiman, R. Mueller |
cond-mat/9507078 | Electromagnetic Absorption in an Anisotropic Layered Superconductor | We calculate the infrared conductivity tensor of a layered superconductor
considering two different order parameter symmetries: strongly anisotropic
$s$-wave with line nodes, and pure ($d_{x^2-y^2}$) $d$-wave. The calculations
are performed within the quasiclassical theory of superconductivity and include
the effects o... | 1995-07-20 | 2009-10-28 | [
"cond-mat",
"supr-con"
] | Mario Palumbo and M.J. Graf |
cond-mat/9507082 | Distribution of local density of states in disordered metallic samples:
logarithmically normal asymptotics | Asymptotical behavior of the distribution function of local density of states
(LDOS) in disordered metallic samples is studied with making use of the
supersymmetric $\sigma$--model approach, in combination with the saddle--point
method. The LDOS distribution is found to have the logarithmically normal
asymptotics for q... | 1995-07-20 | 2009-10-28 | [
"cond-mat"
] | A.D.Mirlin |
cond-mat/9507085 | Mixed symmetry superconductivity in two-dimensional Fermi liquids | We consider a 2D isotropic Fermi liquid with attraction in both $s$ and $d$
channels and examine the possibility of a superconducting state with mixed $s$
and $d$ symmetry of the gap function. We show that both in the weak coupling
limit and at strong coupling, a mixed $s+id$ symmetry state is realized in a
certain ran... | 1995-07-20 | 2009-10-28 | [
"cond-mat"
] | K. Musaelian, J. Betouras, A.V. Chubukov, R. Joynt |
cond-mat/9507080 | Defects in Chiral Columnar Phases: Tilt Grain Boundaries and Iterated
Moire Maps | Biomolecules are often very long with a definite chirality. DNA, xanthan and
poly-gamma-benzyl-glutamate (PBLG) can all form columnar crystalline phases.
The chirality, however, competes with the tendency for crystalline order. For
chiral polymers, there are two sorts of chirality: the first describes the
usual cholest... | 1995-07-20 | 2009-10-28 | [
"cond-mat",
"chao-dyn",
"nlin.CD"
] | Randall D. Kamien and David R. Nelson |
cond-mat/9507079 | Swelling Kinetics of Layered Structures: Triblock Copolymer Mesogels | We consider the swelling kinetics of layered structures. We focus on the case
of triblock copolymer mesogels, although our results are applicable to other
layered structures including clays. We assume the mesogels are swollen by a
solvent that is good for the bridging block but poor for the non-bridging
block. At long ... | 1995-07-20 | 2007-05-23 | [
"cond-mat",
"mtrl-th"
] | C.-M. Chen, F.C. MacKintosh, and D.R.M. Williams |
cond-mat/9507081 | Quasiclassical approach to impurity effect on magnetooscillations in 2D
metals | We develop a quasiclassical method based on the path integral formalism, to
study the influence of disorder on magnetooscillations of the density of states
and conductivity. The treatment is appropriate for electron systems in the
presence of a random potential with large correlation length or a random
magnetic field, ... | 1995-07-20 | 2007-05-23 | [
"cond-mat"
] | A.D.Mirlin, E.Altshuler and P.Woelfle |
cond-mat/9507075 | Pseudospin Symmetry, Peierls Instability, and Charge Density Wave in a
One-Dimensional Tight-Binding Model | We show that there is pseudospin SU(2) symmetry in the one-dimensional
tight-binding model with the inter-molecular electron-phonon interaction. We
discuss the relation between the pseudospin symmetry breaking and the
charge-density wave (CDW). For a finite lattice at half-filling, the Peierls
instability drives the la... | 1995-07-19 | 2007-05-23 | [
"cond-mat"
] | S.Q. Shen and X.C. Xie (Oklahoma State University) |
cond-mat/9507074 | Aharonov-Bohm oscillations in a mesoscopic ring with a quantum dot | We present an analysis of the Aharonov-Bohm oscillations for a mesoscopic
ring with a quantum dot inserted in one of its arms. It is shown that
microreversibility demands that the phase of the Aharonov-Bohm oscillations
changes {\it abruptly} when a resonant level crosses the Fermi energy. We use
the Friedel sum rule t... | 1995-07-19 | 2009-10-28 | [
"cond-mat"
] | A. Levy Yeyati and M. Buttiker |
cond-mat/9507076 | Search for Kosterlitz-Thouless transition in a triangular Ising
antiferromagnet with further-neighbour ferromagnetic interactions | We investigate an antiferromagnetic triangular Ising model with anisotropic
ferromagnetic interactions between next-nearest neighbours, originally proposed
by Kitatani and Oguchi (J. Phys. Soc. Japan {\bf 57}, 1344 (1988)). The phase
diagram as a function of temperature and the ratio between first- and second-
neighbou... | 1995-07-19 | 2009-10-28 | [
"cond-mat"
] | S. L. A. de Queiroz and Eytan Domany |
cond-mat/9507077 | Paired States in the Even Integer Quantum Hall Effect | We argue that a new type of quantum Hall state requiring non-perturbative
Landau level mixing arises at low electron density. In these states, up and
down spin electrons pair to form spinless bosons that condense into a bosonic
quantum Hall state. We describe a wavefunction for a paired quantum Hall state
at $\nu=2$ an... | 1995-07-19 | 2009-10-28 | [
"cond-mat"
] | A. M. Tikofsky and S. A. Kivelson, (ITP, U.C. Santa Barbara) |
cond-mat/9507070 | Electron-phonon coupling close to a metal-insulator transition in one
dimension | We consider a one-dimensional system of electrons interacting via a
short-range repulsion and coupled to phonons close to the metal-insulator
transition at half filling. We argue that the metal-insulator transition can be
described as a standard one dimensional incommensurate to commensurate
transition, even if the ele... | 1995-07-18 | 2015-06-25 | [
"cond-mat"
] | M. Fabrizio, C. Castellani and C. Di Castro |
cond-mat/9507073 | Comment on ``Quasiparticle Decay Effects in the Superconducting Density
of States: Evidence for d-Wave Pairing in the Cuprates'' | We comment on a letter publised in PRL by: D. Coffey and L. Coffey, Phys.
Rev. Lett. {\bf 70}, 1529 (1993) where it is claimed that the dip structure
above the gap is evidence for d-wave pairing. We show that the analysis in this
letter is completely contradictory to all ARPES experiments (including those
which are con... | 1995-07-18 | 2009-10-28 | [
"cond-mat"
] | Georgios Varelogiannis |
cond-mat/9507071 | A Monte Carlo study of O(3) antiferromagnetic models in three dimensions | We study three antiferromagnetic formulations of the O(3) spin model in three
dimensions by means of Monte Carlo simulations: 1. a two parameter $\sigma$
model with nearest and next to nearest neighbors couplings in a cubic lattice;
2. a face centered cubic lattice with nearest neighbors interaction; 3. a cubic
lattice... | 1995-07-18 | 2009-10-28 | [
"cond-mat",
"hep-lat"
] | J. L. Alonso, A. Tarancon (Universidad de Zaragoza), H. G.
Ballesteros, L.A. Fernandez, V. Martin-Mayor and A. Munoz Sudupe (Universidad
Complutense de Madrid) |
cond-mat/9507072 | Cross-over from BCS superconductivity to Bose condensation and High-Tc
Superconductors | We consider the Eliashberg theory in the coupling region where some
fundamental qualitative deviations from the conventional BCS-like behaviour
begin to appear. These deviations are identified as the onset of a cross-over
from BCS superconductivity to Bose condensation. We point out that the
beginning of this cross-ove... | 1995-07-18 | 2007-05-23 | [
"cond-mat"
] | G. Varelogiannis and L. Pietronero |
cond-mat/9507064 | Non-equilibrium quantum noise in chiral Luttinger liquids | We study non-equilibrium noise in Chiral Luttinger Liquids using the
Landauer-Buttiker Scattering approach, obtaining the current/voltage noise
spectrum for a four-terminal measurement scheme. Experimental consequences of
the tunneling of charges are present in the four-terminal measurement of both
the low-frequency sh... | 1995-07-18 | 2007-05-23 | [
"cond-mat",
"hep-th"
] | C. de C. Chamon, D. E. Freed, and X. G. Wen |
cond-mat/9507069 | Evidence of Skyrmion excitations about $\nu =1$ in n-Modulation Doped
Single Quantum Wells by Inter-band Optical Transmission | We observe a dramatic reduction in the degree of spin-polarization of a
two-dimensional electron gas in a magnetic field when the Fermi energy moves
off the mid-point of the spin-gap of the lowest Landau level, $\nu=1$. This
rapid decay of spin alignment to an unpolarized state occurs over small changes
to both higher ... | 1995-07-18 | 2009-10-28 | [
"cond-mat"
] | E. H. Aifer and B. B. Goldberg (Boston University), and D. A. Broido,
(Boston College) |
cond-mat/9507066 | Magneto-Conductance Anisotropy and Interference Effects in Variable
Range Hopping | We investigate the magneto-conductance (MC) anisotropy in the variable range
hopping regime, caused by quantum interference effects in three dimensions.
When no spin-orbit scattering is included, there is an increase in the
localization length (as in two dimensions), producing a large positive MC. By
contrast, with spi... | 1995-07-17 | 2009-10-28 | [
"cond-mat"
] | Ernesto Medina, Mehran Kardar and Rafael Rangel |
cond-mat/9507059 | Plasmon enhancement of Coulomb drag in double quantum well systems | We derive an expression for the drag rate (i.e., interlayer momentum transfer
rate) for carriers in two coupled two-dimensional gases to lowest nonvanishing
order in the screened interlayer electron--electron interaction, valid for {\sl
arbitrary} intralayer scattering mechanisms, using the Boltzmann transport
equation... | 1995-07-17 | 2009-10-28 | [
"cond-mat"
] | Karsten Flensberg (MIC & DFM, DTU) and Ben Yu-Kuang Hu (MIC, DTU) |
cond-mat/9507061 | Critical Exponent of the Localization Length for the Symplectic Case | A new summability method was tested to calculate the critical exponent $\nu$
of the localization length for the symplectic case derived from the non-linear
$\sigma$-model. Although we used the same series as Hikami and others, unlike
them we were able to resum the series in two-dimensions (2D) and obtain the
result $\n... | 1995-07-17 | 2008-11-26 | [
"cond-mat",
"hep-th"
] | Alexander Moroz |
cond-mat/9507065 | First order transition between magnetic order and valence-bond order in
a 2D frustrated Heisenberg model | We study the competition between magnetic order and valence bond order in a
two dimensional (2D) frustrated Heisenberg model introduced some time ago by
Shastry and Sutherland ({\sc B. Sriram Shastry} and {\sc Bill Sutherland}, {\em
Physica} 108{\bf B},1069 (1981) ) for which a configuration of dimers is known
to be th... | 1995-07-17 | 2009-10-28 | [
"cond-mat"
] | Marc Albrecht and Frederic Mila |
cond-mat/9507060 | Variational Hilbert space truncation approach to quantum Heisenberg
antiferromagnets on frustrated clusters | We study the spin-$\frac{1}{2}$ Heisenberg antiferromagnet on a series of
finite-size clusters with features inspired by the fullerenes. Frustration due
to the presence of pentagonal rings makes such structures challenging in the
context of quantum Monte-Carlo methods. We use an exact diagonalization
approach combined ... | 1995-07-17 | 2009-10-28 | [
"cond-mat"
] | N. A. Modine and Efthimios Kaxiras (Department of Physics, Harvard
University) |
cond-mat/9507062 | Computation of Dynamical Structure Factors with the Recursion Method | We compute the energies and transition probabilities for low excitations in
the one dimensional antiferromagnetic spin-1/2 Heisenberg model by means of the
recursion method. We analyse finite size effects in the euclidian time
($\tau$)-representation and compare the resulting estimate for the
thermodynamical limit with... | 1995-07-17 | 2009-10-28 | [
"cond-mat"
] | A Fledderjohann, M Karbach, K-H M\"utter and P Wielath |
cond-mat/9507063 | Charge Density Wave Behaviour of the Integer Quantum Hall Effect Edge
States | We analyze the effect that the Coulomb interaction has on the edge
excitations of an electron gas confined in a bar of thickness $W$, and in
presence of a magnetic field corresponding to filling factor 1 Quantum Hall
effect. We find that the long-range interaction between the edges leads the
system to a ground state wi... | 1995-07-17 | 2009-10-28 | [
"cond-mat"
] | M.Franco and L.Brey |
cond-mat/9507068 | Elastic forces that do no work and the dynamics of fast cracks | Elastic singularities such as crack tips, when in motion through a medium
that is itself vibrating, are subject to forces orthogonal to the direction of
motion and thus impossible to determine by energy considerations alone. This
fact is used to propose a universal scenario, in which three dimensionality is
essential, ... | 1995-07-17 | 2009-10-28 | [
"cond-mat",
"mtrl-th",
"nlin.PS",
"patt-sol"
] | Fernando Lund |
cond-mat/9507067 | Quasiparticle structure and coherent propagation in the
$t-J_{z}-J_{\perp}$ model | Numerical studies, from variational calculation to exact diagonalization, all
indicate that the quasiparticle generated by introducing one hole into a
two-dimensional quantum antiferromagnet has the same nature as a string state
in the $t-J_{z}$ model. Based on this observation, we attempt to visualize the
quasiparticl... | 1995-07-17 | 2009-10-28 | [
"cond-mat"
] | Junwu Gan and Per Hedegard |
cond-mat/9507056 | Roughness of Randomly Crumpled Elastic Sheets | We study the roughness of randomly crumpled elastic sheets. Based on
analytical and numerical calculations, we find that they are self affine with a
roughness exponent equal to one. Such crumpling occurs {\it e.g.\/} when wet
paper dries. We also discuss the case of correlated crumpling, which occurs in
connection with... | 1995-07-15 | 2007-05-23 | [
"cond-mat",
"mtrl-th"
] | F. Tzschichholz, A. Hansen and S. Roux |
cond-mat/9507058 | Spatial Coherence of Tunneling in Double Wells | We argue that the tunneling between two 2D electron gases in a weak magnetic
field is of resonance character, and involves a long lifetime excitonic state
of an electron and hole {\it uniformly spread} over cyclotron orbits. We find
that the tunneling gap is linear in the field, in agreement with the
experiment, and is... | 1995-07-15 | 2007-05-23 | [
"cond-mat"
] | L. S. Levitov and A. V. Shytov |
cond-mat/9507057 | Analytical Results for Random Band Matrices with Preferential Basis | Using the supersymmetry method we analytically calculate the local density of
states, the localiztion length, the generalized inverse participation ratios,
and the distribution function of eigenvector components for the superposition
of a random band matrix with a strongly fluctuating diagonal matrix. In this
way we ex... | 1995-07-15 | 2009-10-28 | [
"cond-mat",
"chao-dyn",
"nlin.CD"
] | Klaus Frahm and Axel M\"uller--Groeling |
cond-mat/9507053 | Spin fluctuations of a random vacuum state: a new approach to the Kondo
lattice | We address the Kondo lattice with one conduction band by introducing a
representation of the (s=1/2) local moments consisting in an s=1 triplet of
spin fluctuations of a vacuum state. The excitation of these fluctuations by
the electronic field results in the creation of new fermionic modes. It is
shown that, in the on... | 1995-07-14 | 2008-02-03 | [
"cond-mat"
] | J.M. Prats and F. Lopez-Aguilar |
cond-mat/9507050 | Spin Conductivity and Spin-Charge Separation in the High $T_c$ Cuprates | We study both the spin and electrical conductivities in models of relevance
to the high $T_c$ cuprates. These models describe metallic states with or
without spin-charge separation. We demonstrate that, given a linear in
temperature dependence of the electrical resistivity, the spin resistivity
should also be linear in... | 1995-07-14 | 2007-05-23 | [
"cond-mat"
] | Qimiao Si (Department of Physics, University of Illinois) |
cond-mat/9507051 | Effect of conduction electron interactions on Anderson impurities | The effect of conduction electron interactions for an Anderson impurity is
investigated in one dimension using a scaling approach. The flow diagrams are
obtained by solving the renormalization group equations numerically. It is
found that the Anderson impurity case is different from its counterpart -- the
Kondo impurit... | 1995-07-14 | 2009-10-28 | [
"cond-mat"
] | Yanmin Li (U. of Warwick) |
cond-mat/9507055 | Random Quantum Spin Chains: A Real-Space Renormalization Group Study | Quantum Heisenberg spin chains with random couplings and spin sizes are
studied using a real-space renormalization group technique. These systems
belong to a new universality class of disordered quantum spin systems realized
in {\it e.g.} ${\rm Sr}_3{\rm CuPt}_{1-x}{\rm Ir}_x {\rm O}_6$. The low-energy
fixed point is c... | 1995-07-14 | 2009-10-28 | [
"cond-mat"
] | E. Westerberg, A. Furusaki, M. Sigrist and P. A. Lee (MIT) |
cond-mat/9507052 | Density of States Driven Anisotropies Induced by Momentum Decoupling in
High-Tc Superconductors | Momentum decoupling arises when small momentum transfer processes dominate
the electron-phonon scattering and implies that anisotropies in
superconductivity are driven by the anisotropies of the density of states.
Considering an isotropic s-wave interaction in the momentum decoupling regime
we give a natural simultaneo... | 1995-07-14 | 2009-10-28 | [
"cond-mat"
] | G. Varelogiannis, A. Perali, E. Cappelluti and L. Pietronero |
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