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 |
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cond-mat/9410033 | Density Expansion for the Mobility in a Quantum Lorentz Model | We consider the mobility of electrons in an environment of static hard-sphere
scatterers, which provides a realistic description of electrons in Helium gas.
A systematic expansion in the scatterer density is carried to second order
relative to the Boltzmann result, and the analytic contribution at this order
is derived... | 1994-10-10 | 2009-10-22 | [
"cond-mat"
] | K.I.Wysokinski, W.Park, D.Belitz, and T.R.Kirkpatrick |
cond-mat/9410030 | Effective chiral-spin Hamiltonian for odd-numbered coupled Heisenberg
chains | An $L \times \infty$ system of odd number of coupled Heisenberg spin chains
is studied using a degenerate perturbation theory, where $L$ is the number of
coupled chains. An effective chain Hamiltonian is derived explicitly in terms
of two spin half degrees of freedom of a closed chain of $L$ sites, valid in
the regime ... | 1994-10-10 | 2009-10-22 | [
"cond-mat"
] | V. Subrahmanyam (ICTP, P.O. Box 586, Triste 34100, Italy) |
cond-mat/9410032 | Off-diagonal Interactions, Hund's Rules and Pair-binding in Hubbard
Molecules | We have studied the effect of including nearest-neighbor, electron-electron
interactions, in particular the off-diagonal (non density-density) terms, on
the spectra of truncated tetrahedral and icosahedral ``Hubbard molecules,''
focusing on the relevance of these systems to the physics of doped C$_{60}$.
Our perturbati... | 1994-10-10 | 2009-10-22 | [
"cond-mat"
] | S. L. Sondhi, M. P. Gelfand, H. Q. Lin and D. K. Campbell |
cond-mat/9410031 | Origin of Intrinsic Josephson Coupling in the Cuprates and Its Relation
to Order Parameter Symmetry: An Incoherent Hopping Model | Experiments on the cuprate superconductors demonstrate that these materials
may be viewed as a stack of Josephson junctions along the c-direction. In this
paper, we present a model which describes this intrinsic Josephson coupling in
terms of incoherent quasiparticle hopping along the c-axis arising from
wave-function ... | 1994-10-10 | 2009-10-22 | [
"cond-mat"
] | R. J. Radtke and K. Levin |
cond-mat/9410027 | A Hybrid Method for Global Updates in Monte Carlo Study | We propose a new algorithm which works effectively in global updates in Monte
Carlo study. We apply it to the quantum spin chain with next-nearest-neighbor
interactions. We observe that Monte Carlo results are in excellent agreement
with numerically exact ones obtained by the transfer matrix method. | 1994-10-10 | 2017-02-01 | [
"cond-mat"
] | Tomo Munehisa and Yasuko Munehisa |
cond-mat/9410026 | A New Supersymmetric and Exactly Solvable Model of Correlated Electrons | A new lattice model is presented for correlated electrons on the unrestricted
$4^L$-dimensional electronic Hilbert space $\otimes_{n=1}^L{\bf C}^4$ (where
$L$ is the lattice length). It is a supersymmetric generalization of the
Hubbard model, but differs from the extended Hubbard model proposed by Essler,
Korepin and S... | 1994-10-10 | 2009-10-22 | [
"cond-mat",
"hep-th"
] | Anthony J. Bracken, Mark D. Gould, Jon R. Links and Yao-Zhong Zhang |
cond-mat/9410029 | Exact solutions of a restricted ballistic deposition model on a
one-dimensional staircase | Surface structure of a restricted ballistic deposition(RBD) model is examined
on a one-dimensional staircase with free boundary conditions. In this model,
particles can be deposited only at the steps of the staircase. We set up
recurrence relations for the surface fluctuation width $W$ using generating
function method.... | 1994-10-10 | 2009-10-22 | [
"cond-mat"
] | Hyunggyu Park, Meesoon Ha, and In-mook Kim |
cond-mat/9410025 | The Flux-Phase of the Half-Filled Band | The conjecture is verified that the optimum, energy minimizing magnetic flux
for a half-filled band of electrons hopping on a planar, bipartite graph is
$\pi$ per square plaquette. We require {\it only} that the graph has
periodicity in one direction and the result includes the hexagonal lattice
(with flux 0 per hexago... | 1994-10-09 | 2009-10-22 | [
"cond-mat"
] | E.H. Lieb |
cond-mat/9410019 | Crossover from Spin-Density-Wave to Neel-like Ground state | The characterization and evolution of a Spin Density Wave into the Quantum
Neel ground state is considered in the context of a weak coupling theory of the
half-filled Hubbard model. Magnetic properties obtained from this weak coupling
approach in one dimension compare favorably with exact results from Bethe
ansatz (BA)... | 1994-10-07 | 2009-10-22 | [
"cond-mat"
] | Jaime Ferrer |
cond-mat/9410023 | Possible Relevance of Odd Frequency Pairing to Heavy Fermion
Superconductivity | What is the character of the gapless quasiparticles in heavy fermion
superconductors (HFSC)? We discuss an odd-frequency pairing interpretation of
HFSC which leads to a two component model for the quasiparticle excitations. In
this picture, line zeroes of unpaired electrons may coexist with gapless
surfaces of paired e... | 1994-10-07 | 2009-10-22 | [
"cond-mat"
] | P. COLEMAN (Rutgers) E. Miranda (NHMFL, Tallahassee) |
cond-mat/9410018 | Chern-Simons Superconductivity at finite magnetic field | We study Chern-Simons (CS) superconductivity in the presence of uniform
external magnetic field of {\it arbitrary strength} for a system of fermions in
two spatial dimensions, which are minimally coupled both to the CS and Maxwell
gauge fields. We have carried out the computation within the mean field ansatz.
Analysing... | 1994-10-07 | 2009-10-22 | [
"cond-mat"
] | Sudhansu S. Mandal, S. Ramaswamy, V. Ravishankar |
cond-mat/9410021 | Model for FeSi, a strongly correlated insulator | Revised to reflect the differences between the second order perturbation
theory method developed by Scheitzer and Czycholl, and followed by us, and the
iterated perturbation theory (IPT)of Georges and Kotliar, et al. Because of our
domain of interest, this does not materially change our conclusions, but it is
important... | 1994-10-07 | 2009-10-22 | [
"cond-mat"
] | C. Fu and S. Doniach |
cond-mat/9410022 | Aging on Parisi's tree | We present a detailed study of simple `tree' models for off equilibrium
dynamics and aging in glassy systems. The simplest tree describes the landscape
of a random energy model, whereas multifurcating trees occur in the solution of
the Sherrington-Kirkpatrick model. An important ingredient taken from these
models is th... | 1994-10-07 | 2009-10-22 | [
"cond-mat"
] | J-P. Bouchaud and D.S. Dean |
cond-mat/9410017 | Aharonov-Bohm Effect in Luttinger Liquid and Beyond | In systems with the spin-charge separation, the period of the Aharonov-Bohm
(AB) oscillation becomes half of the flux quantum. This effect is at least
related to the fact that for the creation of the holons (spinons) are needed
two electrons. The effect is illustrated on the example of the Hubbard
Hamiltonian with the ... | 1994-10-07 | 2007-05-23 | [
"cond-mat"
] | F.V. Kusmartsev |
cond-mat/9410016 | Phase Transitions of Frustrated XY spins in Two Dimensions | The row model is used to study the commensurate-incommensurate (C-IC) an
isotropic (FFTXY) transitions of the frustrated 2D XY model on the triangular
lattice. New relevant variables clarify the physics of these transitions: phase
and chiral variables are coupled so that spin waves generate long range polar
interaction... | 1994-10-06 | 2007-05-23 | [
"cond-mat"
] | M. Benakli, M. Gabay and W.M. Saslow |
cond-mat/9410015 | Theory for Nonlinear Mie-Scattering from Spherical Metal Clusters | Using classical electrodynamics we determine the angular dependence of the
light intensities radiated in second and third harmonic generation by spherical
metal clusters. Forward and backward scattering is analyzed in detail. Also
resonance effects in the integrated intensities are studied. Our work treats
the case of ... | 1994-10-06 | 2007-05-23 | [
"cond-mat"
] | J. Dewitz, W. Hubner, and K. H. Bennemann (Institut f\"ur Theoretische
Physik der Freien Universit\"at Berlin,Arnimallee 14, 14195 Berlin, Germany) |
cond-mat/9410014 | Andreev Reflection In Ferromagnet-Superconductor Junctions | The transport properties of a ferromagnet-superconductor (FS) junction are
studied in a scattering formulation. Andreev reflection at the FS interface is
strongly affected by the exchange interaction in the ferromagnet. The
conductance G_FS of a ballistic point contact between F and S can be both
larger or smaller than... | 1994-10-06 | 2017-12-07 | [
"cond-mat"
] | M. J. M. de Jong and C. W. J. Beenakker |
cond-mat/9410011 | Generalized Ohm's law | A small review on scattering approach to electric transport. Transmission
distribution can be gotten from Ohm's law and/or circuit theory. Send me a
postcard if you read it all and enjoy. | 1994-10-05 | 2007-05-23 | [
"cond-mat"
] | Yuli Nazarov |
cond-mat/9410012 | Premelting of Thin Wires | Recent work has raised considerable interest on the nature of thin metallic
wires. We have investigated the melting behavior of thin cylindrical Pb wires
with the axis along a (110) direction, using molecular dynamics and a
well-tested many-body potential. We find that---in analogy with cluster
melting---the melting te... | 1994-10-05 | 2015-06-25 | [
"cond-mat"
] | O. Gulseren, F. Ercolessi and E. Tosatti (Scuola Internazionale
Superiore di Studi Avanzati (SISSA), Via Beirut 2-4, I-34014 Trieste, Italy) |
cond-mat/9410013 | Renormalization Group and Fermi Liquid Theory | We give a Hamiltonian based interpretation of microscopic Fermi liquid theory
within a renormalization group framework. We identify the fixed point
Hamiltonian of Fermi liquid theory, with the leading order corrections, and
show that this Hamiltonian in mean field theory gives the Landau
phenomenological theory. A reno... | 1994-10-05 | 2015-06-25 | [
"cond-mat"
] | A.C. Hewson |
cond-mat/9410008 | Laughlin liquid - Wigner solid transition at high density in wide
quantum wells | Assuming that the phase transition between the Wigner solid and the Laughlin
liquid is first-order, we compare ground-state energies to find features of the
phase diagram at fixed $\nu$. Rather than use the Coulomb interaction, we
calculate the effective interaction in a square quantum well, and fit the
results to a mo... | 1994-10-04 | 2009-10-22 | [
"cond-mat"
] | Rodney Price, Xuejun Zhu, S. Das Sarma, and P.M. Platzman |
cond-mat/9410007 | A Cellular Automaton Model for Diffusive and Dissipative Systems | We study a cellular automaton model, which allows diffusion of energy (or
equivalently any other physical quantities such as mass of a particular
compound) at every lattice site after each timestep. Unit amount of energy is
randomly added onto a site. Whenever the local energy content of a site reaches
a fixed threshol... | 1994-10-04 | 2009-10-22 | [
"cond-mat"
] | T.C.Chan (Dept of Phys, U of Hong Kong), H.F.Chau (IAS, Princeton),
and K.S.Cheng (Dept of Phys, U of Hong Kong) |
cond-mat/9410009 | Mean-field transfer-matrix study of the magnetic phase diagram of
CsNiF$_{\bf 3}$ | A method for treating ferromagnetic chains coupled with antiferromagnetic
interactions on an hexagonal lattice is presented in this paper. The solution
of the $1D$ part of the problem is obtained by classical transfer-matrix while
the coupling between the chains is processed by mean-field theory. This method
is applied... | 1994-10-04 | 2009-10-22 | [
"cond-mat"
] | Y. Trudeau, M. L. Plumer (Centre de Recherche en Physique du Solide et
D\'epartement de Physique Universit\'e de Sherbrooke, Sherbrooke, Qu\'ebec,
Canada) |
cond-mat/9410035 | Wigner crystal states for the two-dimensional electron gas in a double
quantum well system | Using the Hartree-Fock approximation, we calculate the energy of different
Wigner crystal states for the two-dimensional electron gas of a double quantum
well system in a strong magnetic field. Our calculation takes interlayer
hopping as well as an in-plane magnetic field into consideration. The ground
The ground state... | 1994-10-04 | 2009-10-22 | [
"cond-mat"
] | Lian Zheng and H. A. Fertig (Univ. Kentucky) |
cond-mat/9410006 | Phase transitions in interacting domain-wall model | We investigate the interacting domain-wall model derived from the
triangular-lattice antiferromagnetic Ising model with two next-nearest-neighbor
interactions. The system has commensurate phases with a domain-wall density
$q=2/3$ as well as that of $q=0$ when the interaction is repulsive. The $q=2/3$
commensurate phase... | 1994-10-04 | 2009-10-22 | [
"cond-mat"
] | Jae Dong Noh and Doochul Kim |
cond-mat/9410001 | Orientation of particle attachment and local isotropy in diffusion
limited aggregation (DLA) | We simulate 50 off-lattice DLA clusters, one million particles each. The
probability distribution of the angle of attachment of arriving particles with
respect to the local radial direction is obtained numerically. For increasing
cluster size, $N$, the distribution crosses over extremely accurately to a
cosine, whose a... | 1994-10-03 | 2009-10-22 | [
"cond-mat"
] | Chi-Hang Lam |
cond-mat/9410004 | Renormalization group approach to zero temperature Bose condensation | The paper contains some preliminary results about the problem of Bose
condensation at zero temperature. It is shown that the usual picture of three
dimensional Bose condensation, the so called Bogoliubov approximation, can be
explained in terms of a renormalization group flow, showing asymptotic freedom
and anomalous (... | 1994-10-03 | 2009-10-22 | [
"cond-mat"
] | G. Benfatto |
cond-mat/9410005 | Landau theory of phase separation in cuprates | I discuss the problem of phase separation in cuprates from the point of view
of the Landau theory of Fermi liquids. I calculate the rate of growth of
unstable regions for the hydrodymanics and collisionless limit and, in presence
of long range Coulomb interactions, the size of these regions. These are
analytic results ... | 1994-10-03 | 2009-10-22 | [
"cond-mat"
] | A.H.Castro Neto |
cond-mat/9410002 | Tunneling Between Two-Dimensional Electron Gases in a Strong Magnetic
Field | We have measured the tunneling between two two-dimensional electron gases at
high magnetic fields $B$, when the carrier densities of the two electron layers
are matched. For filling factors $\nu<1$, there is a gap in the current-voltage
characteristics centered about $V=0$, followed by a tunneling peak at $\sim
6$~mV. ... | 1994-10-03 | 2009-10-22 | [
"cond-mat"
] | K.M. Brown, N. Turner, J.T. Nicholls, E.H. Linfield, M. Pepper, D.A.
Ritchie, and G.A.C. Jones |
cond-mat/9410010 | Phase Diagrams for Deformable Toroidal and Spherical Surfaces with
Intrinsic Orientational Order | A theoretical study of toroidal membranes with various degrees of intrinsic
orientational order is presented at mean-field level. The study uses a simple
Ginzburg-Landau style free energy functional, which gives rise to a rich
variety of physics and reveals some unusual ordered states. The system is found
to exhibit ma... | 1994-10-03 | 2009-10-22 | [
"cond-mat"
] | R.M.L.Evans |
cond-mat/9410003 | Nearly Localized States in Weakly Disordered Conductor | The time dispersion of the averaged conductance $G(t)$ of a mesoscopic sample
is calculated in the long time limit when $t$ is much larger than the diffusion
travelling time $ t_D$. In this case the functional integral in the effective
supersymmetric field theory is determined by the saddle point contribution. If
$t$ i... | 1994-10-03 | 2009-10-22 | [
"cond-mat"
] | B.A.Muzykantskii and D.E.Khmelnitski |
cond-mat/9409124 | Dynamics of T=0 BCS condensates | Fermi-surface bosonization is used to show that the long-wavelength, $T=0$,
dynamics of a BCS superfluid or superconductor is described by a galilean
invariant non-linear time-dependent Schr{\"o}dinger equation. This equation is
of same form as the Gross-Pitaevskii equation for a Bose superfluid, but the
``wavefunction... | 1994-10-02 | 2015-06-25 | [
"cond-mat"
] | Michael Stone |
cond-mat/9409123 | Non-Universality in Random Matrix Ensembles with Soft Level Confinement | Two families of strongly non-Gaussian random matrix ensembles (RME) are
considered. They are statistically equivalent to a one-dimensional plasma of
particles interacting logarithmically and confined by the potential that has
the long-range behavior $V(\epsilon)\sim |\epsilon|^{\alpha}$ ($0<\alpha<1$),
or $V(\epsilon)\... | 1994-10-02 | 2009-10-22 | [
"cond-mat"
] | C.M. Canali, Mats Wallin, and V.E. Kravtsov |
cond-mat/9409122 | Current density functional theory of quantum dots in a magnetic field | We present a study of ground state energies and densities of quantum dots in
a magnetic field, which takes into account correlation effects through the
Current-density functional theory (CDFT). The method is first tested against
exact results for the energy and density of 2 and 3 electrons quantum dots, and
it is found... | 1994-10-01 | 2009-10-22 | [
"cond-mat"
] | M. Ferconi and G. Vignale |
cond-mat/9409120 | 2D-3D Vortex Line Transition in Two-Layer Josephson Arrays | We calculate the dynamical response of two-layer Josephson arrays to a bias
current applied into only one layer (primary layer), in a perpendicular
magnetic field. The pancake vortices in the two layers sometimes form into flux
lines which move as a unit under the influence of the bias current. The lines
break apart in... | 1994-09-29 | 2009-10-22 | [
"cond-mat"
] | Wenbin Yu and David G. Stroud |
cond-mat/9409121 | Computational Lattice-Gas Modeling of the Electrosorption of Small
Molecules and Ions | We present two recent applications of lattice-gas modeling techniques to
electrochemical adsorption on catalytically active metal substrates: urea on
Pt(100) and (bi)sulfate on Rh(111). Both involve the specific adsorption of
small molecules or ions on well-characterized single-crystal electrodes, and
they provide a pa... | 1994-09-29 | 2009-10-22 | [
"cond-mat"
] | P.A. Rikvold, M. Gamboa-Aldeco, J. Zhang, M. Han, Q. Wang, H.L.
Richards, and A. Wieckowski |
cond-mat/9409115 | Magnetic properites of the Heavy Fermion Antiferromagnets YbNiAl and
YbPtAl | Measurements of electrical resistivity and Hall effect as a function of
magnetic field on the Heavy Fermion Systems YbNiAl and YbPtAl are presented.
Both compounds order antiferro magnetically and show metamagnetic behavior in a
magnetic field. Scaling behavior of the magnetoresistance above TN suggests
that the parama... | 1994-09-28 | 2009-10-22 | [
"cond-mat"
] | J. Diehl, H. Davideit, S. Klimm and S. Horn (Lehrstuhl fuer
Experimentalphysik II, Uni-Augsburg, 86135 Augsburg, Germany) U.Tegel, C.
Geibel and F. Steglich (Institut fuer Festkoerperphysik, TH Darmstadt, 64289
Darmstadt, Germany) |
cond-mat/9409119 | On the out of equilibrium order parameters in long-range spin-glases | We show that the dynamical order parameters can be reexpressed in terms of
the distribution of the staggered auto-correlation and response functions. We
calculate these distributions for the out of equilibrium dynamics of the
Sherrington-Kirpatrick model at long times. The results suggest that the
landscape this model ... | 1994-09-28 | 2009-10-22 | [
"cond-mat"
] | A. Baldassarri, L. F. Cugliandolo, J. Kurchan and G. Parisi |
cond-mat/9409118 | Geometrical Approach to Bosonization of D>1 Dimensional (Non) Fermi
Liquids | We discuss an approach to higher dimensional bosonization of interacting
fermion s based on a picture of fluctuating Fermi surface. Compared with the
linearized"constructive" approach developed in Refs.[9-11] this method allows
an account of the Fermi surface curvature due to nongaussian terms in the
bosonized Lagrangi... | 1994-09-28 | 2009-10-22 | [
"cond-mat"
] | D.V. Khveshchenko |
cond-mat/9409117 | Current--Voltage Characteristics of Two--Dimensional Vortex Glass Models | We have performed Monte Carlo simulations to determine current--voltage
characteristics of two different vortex glass models in two dimensions. The
results confirm the conclusions of earlier studies that there is a transition
at $T=0$. In addition we find that, as $T\to 0$, the linear resistance vanishes
exponentially,... | 1994-09-28 | 2009-10-22 | [
"cond-mat"
] | R. A. Hyman, M. Wallin, M. P. A. Fisher, S. M. Girvin, A. P. Young |
cond-mat/9409116 | Exact solution of new integrable nineteen-vertex models and quantum
spin-1 chains | New exactly solvable nineteen vertex models and related quantum spin-1 chains
are solved. Partition functions, excitation energies, correlation lengths, and
critical exponents are calculated. It is argued that one of the non-critical
Hamiltonians is a realization of an integrable Haldane system. The finite-size
spectra... | 1994-09-28 | 2009-10-22 | [
"cond-mat"
] | A. Kl\"umper, S. I. Matveenko, J. Zittartz |
cond-mat/9409114 | Resonant two-magnon Raman scattering in antiferromagnetic insulators | We propose a theory of two-magnon {\it resonant\/} Raman scattering from
antiferromagnetic insulators, which contains information both on the magnetism
and the carrier properties in the lighly doped phases. We argue that the
conventional theory does not work in the resonant regime, in which the energy
of the incident p... | 1994-09-27 | 2009-10-22 | [
"cond-mat"
] | Andrey V. Chubukov and David M. Frenkel |
cond-mat/9409110 | Universal Correlations in the random matrices and 1D particles with long
range interactions in a confinement potential | We study the correlations between eigenvalues of the large random matrices by
a renormalization group approach. The results strongly support the universality
of the correlations proposed by Br\'ezin and Zee. Then we apply the results to
the ground state of the 1D particles with long range interactions in a
confinement ... | 1994-09-26 | 2009-10-22 | [
"cond-mat",
"hep-th"
] | Y. Morita, Y. Hatsugai and M. Kohmoto |
cond-mat/9409112 | Quantum simulations of the superfluid-insulator transition for
two-dimensional, disordered, hard-core bosons | We introduce two novel quantum Monte Carlo methods and employ them to study
the superfluid-insulator transition in a two-dimensional system of hard-core
bosons. One of the methods is appropriate for zero temperature and is based
upon Green's function Monte Carlo; the other is a finite-temperature world-line
cluster alg... | 1994-09-26 | 2009-10-22 | [
"cond-mat"
] | Shiwei Zhang, N. Kawashima, J. Carlson, and J.E. Gubernatis |
cond-mat/9409109 | Is Hall Conductance in Hall Bar Geometry a Topological Invariant? | A deep connection between the Hall conductance in realistic situation and a
topological invariant is pointed out based on von-Neumann lattice
representation in which Landau level electrons have minimum spatial extensions.
We show that the Hall conductance has no finite size correction in quantum Hall
regime, but a coef... | 1994-09-26 | 2007-05-23 | [
"cond-mat"
] | K. Ishikawa, N. Maeda, and K. Tadaki |
cond-mat/9409111 | Results on two-bit gate design for quantum computers | We present numerical results which show how two-bit logic gates can be used
in the design of a quantum computer. We show that the Toffoli gate, which is a
universal gate for all classical reversible computation, can be implemented
using a particular sequence of exactly five two-bit gates. An arbitrary
three-bit unitary... | 1994-09-26 | 2007-05-23 | [
"cond-mat",
"hep-lat",
"hep-th",
"quant-ph"
] | David P. DiVincenzo and John Smolin |
cond-mat/9409113 | Wick's Theorem and a New Perturbation Theory Around the Atomic Limit of
Strongly Correlated Electron Systems | A new type of perturbation expansion in the mixing $V$ of localized orbitals
with a conduction-electron band in the $U\to\infty$ Anderson model is
presented. It is built on Feynman diagrams obeying standard rules. The local
correlations of the unperturbed system (the atomic limit) are included exactly,
no auxiliary par... | 1994-09-26 | 2009-10-22 | [
"cond-mat",
"hep-th"
] | Jan Brinckmann (Technische Hochschule Darmstadt, Germany) |
cond-mat/9409108 | Bounds on the decay of the auto-correlation in phase ordering dynamics | We obtain bounds on the decay exponent lambda of the autocorrelation function
in phase ordering dynamics. For non-conserved order parameter, we recover the
Fisher and Huse inequality, lambda > = d/2. If the order parameter is conserved
we also find lambda >= d/2 if the initial time t1 = 0. However, for t1 in the
scalin... | 1994-09-24 | 2007-05-23 | [
"cond-mat"
] | Chuck Yeung, Madan Rao and Rashmi Desai |
cond-mat/9409102 | Spin and charge dynamics of the t-J model at intermediate electron
densities: absence of spin-charge separation | We present an exact diagonalization study of the dynamical spin and density
correlation functions in small clusters of 2D t-J model for intermediate and
low electron densities, rho<0.7. Both correlation functions agree remarkably
well with the convolution of the single-particle spectral function, i.e. the
simplest esti... | 1994-09-23 | 2009-10-22 | [
"cond-mat"
] | R. Eder and Y. Ohta (Department of Applied Physics, Nagoya University) |
cond-mat/9409105 | Dynamics of Tunneling Centers in Metallic Systems | Dynamics of tunneling centers (TC) in metallic systems is studied, using the
technique of bosonization. The interaction of the TC with the conduction
electrons of the metal involves two processes, namely, the screening of the TC
by electrons, and the so-called electron assisted tunneling. The presence of
the latter pro... | 1994-09-23 | 2009-10-22 | [
"cond-mat"
] | Tabish Qureshi |
cond-mat/9409104 | Universal Prefactor of Activated Conductivity in the Quantum Hall Effect | The prefactor of the activated dissipative conductivity in a plateau range of
the quantum Hall effect is studied in the case of a long-range random
potential. It is shown that due to long time it takes for an electron to drift
along the perimeter of a large percolation cluster, phonons are able to
maintain quasi-equili... | 1994-09-23 | 2009-10-22 | [
"cond-mat"
] | D. G. Polyakov and B. I. Shklovskii |
cond-mat/9409106 | Inverse Avalanches On Abelian Sandpiles | A simple and computationally efficient way of finding inverse avalanches for
Abelian sandpiles, called the inverse particle addition operator, is presented.
In addition, the method is shown to be optimal in the sense that it requires
the minimum amount of computation among methods of the same kind. The method is
also c... | 1994-09-23 | 2009-10-22 | [
"cond-mat"
] | H. F. Chau (School of Natural Sciences, Institute for Advanced Study,
Olden Lane, Princeton, NJ 08540 and Department of Physics, University of
Illinios, 1110 W. Green Street, Urbana, IL 61801) |
cond-mat/9409101 | Commensurability Effects in Large Josephson Junctions | Two types of commensurability effects are possible in a large Josephson
junction patterned with columnar defects. The first occurs for a periodic array
of pins when the mean fluxon spacing (tuned by the magnitude of the applied
in--plane magnetic field) is a rational fraction of the defect spacing. We show
that this ef... | 1994-09-23 | 2009-10-22 | [
"cond-mat"
] | Leon Balents and Steven H. Simon |
cond-mat/9409103 | Replica Symmetry Breaking Instability in the 2D XY model in a random
field | We study the 2D vortex-free XY model in a random field, a model for randomly
pinned flux lines in a plane. We construct controlled RG recursion relations
which allow for replica symmetry breaking (RSB). The fixed point previously
found by Cardy and Ostlund in the glass phase $T<T_c$ is {\it unstable} to RSB.
The suscep... | 1994-09-23 | 2009-10-22 | [
"cond-mat"
] | P. Le Doussal and T. Giamarchi |
cond-mat/9409107 | Exact Groundstates for Antiferromagnetic Spin-One Chains with Nearest
and Next-Nearest Neighbour Interactions | We have found the exact ground state for a large class of antiferromagnetic
spin-one chains with nearest and next-nearest neighbour interactions. The
ground state is characterized as a matrix product of local site states and has
the properties characteristic of the Haldane scenario. | 1994-09-23 | 2009-10-22 | [
"cond-mat"
] | C. Lange, A. Kl\"umper, J. Zittartz |
cond-mat/9409100 | Conformal Field Theory Approach to the 2-Impurity Kondo Problem:
Comparison with Numerical Renormalization Group Results | Numerical renormalization group and conformal field theory work indicate that
the two impurity Kondo Hamiltonian has a non-Fermi liquid critical point
separating the Kondo-screening phase from the inter-impurity singlet phase when
particle-hole (P-H) symmetry is maintained. We clarify the circumstances under
which this... | 1994-09-22 | 2009-10-22 | [
"cond-mat",
"hep-th"
] | Ian Affleck, Andreas W.W. Ludwig and Barbara A. Jones |
cond-mat/9409096 | Angular Dependent Soft X-ray Absorption Spectroscopy of V2O5 and V6O13 | We have measured the V 2p3/2 and O 1s x-ray absorption spectra of single
crystal V2O5 and V6O13 and compared to linear combinations of atomic orbitals
(LCAO) density of states (DOS) calculations. The spectra change dramatically
with incident angle. The use of polarized light and a single crystal limits the
number of tr... | 1994-09-22 | 2009-10-22 | [
"cond-mat"
] | E. Goering,(1) O. M\"uller,(1) M. Klemm,(1) J. P. Urbach,(1) H.
Petersen,(2) C. Jung,(2) M. L. denBoer,(3) and S. Horn (1) ((1)Institut f\"ur
Physik, University of Augsburg, 86159 Augsburg, Germany (2)BESSY, Lentzealle
100, 14195 Berlin, Germany (3)Physics Dept., Hunter College CUNY, New York
NY, USA) |
cond-mat/9409098 | A Perturbative/Variational Approach to Quantum Lattice Hamiltonians | We propose a method to construct the ground state $\psi(\lambda)$ of local
lattice hamiltonians with the generic form $H_0 + \lambda H_1$, where $\lambda$
is a coupling constant and $H_0$ is a hamiltonian with a non degenerate ground
state $\psi_0$. The method is based on the choice of an exponential ansatz
$\psi(\lamb... | 1994-09-22 | 2009-10-22 | [
"cond-mat",
"hep-th"
] | J. G. Esteve and Germ\'an Sierra |
cond-mat/9409097 | Field Theory And Second Renormalization Group For Multifractals In
Percolation | The field-theory for multifractals in percolation is reformulated in such a
way that multifractal exponents clearly appear as eigenvalues of a second
renormalization group. The first renormalization group describes geometrical
properties of percolation clusters, while the second-one describes electrical
properties, inc... | 1994-09-22 | 2009-10-22 | [
"cond-mat"
] | B. Fourcade (Institut Laue Langevin and Maison des Magist\`eres) and
Jean Perrin (C.N.R.S. and A.-M.S. Tremblay D\'epartement de physique and CRPS
Universit\'e de Sherbrooke) |
cond-mat/9409095 | Universal Behavior of Correlations between Eigenvalues of Random
Matrices | The universal connected correlations proposed recently between eigenvalues of
unitary random matrices is examined numerically. We perform an ensemble average
by the Monte Carlo sampling. Although density of eigenvalues and a bare
correlation of the eigenvalues are not universal, the connected correlation
shows a univer... | 1994-09-22 | 2016-08-31 | [
"cond-mat",
"hep-th"
] | T. S. Kobayakawa, Y. Hatsugai, M. Kohmoto and A. Zee |
cond-mat/9409093 | Absence of re-entrant phase transition of the antiferromagnetic Ising
model on the simple cubic lattice: Monte Carlo study of the hard-sphere
lattice gas | We perform the Monte Carlo simulations of the hard-sphere lattice gas on the
simple cubic lattice with nearest neighbour exclusion. The critical activity is
estimated, $z_{\rm c} = 1.0588 \pm 0.0003$. Using a relation between the
hard-sphere lattice gas and the antiferromagnetic Ising model in an external
magnetic fiel... | 1994-09-22 | 2015-06-25 | [
"cond-mat"
] | Atsushi Yamagata |
cond-mat/9409099 | An algorithm to calculate the transport exponent in strip geometries | An algorithm for solving the random resistor problem by means of the
transfer-matrix approach is presented. Preconditioning by spanning clusters
extraction both reduces the size of the conductivity matrix and speed up the
calculations. | 1994-09-22 | 2009-10-22 | [
"cond-mat"
] | F.Babalievski |
cond-mat/9409088 | The Energy-Scaling Approach to Phase-Ordering Growth Laws | We present a simple, unified approach to determining the growth law for the
characteristic length scale, $L(t)$, in the phase ordering kinetics of a system
quenched from a disordered phase to within an ordered phase. This approach,
based on a scaling assumption for pair correlations, determines $L(t)$
self-consistently... | 1994-09-21 | 2009-10-22 | [
"cond-mat"
] | A. D. Rutenberg and A. J. Bray |
cond-mat/9409089 | Dynamics of Particles Deposition on a Disordered Substrate: II. Far-from
Equilibrium Behavior. - | The deposition dynamics of particles (or the growth of a rigid crystal) on a
disordered substrate at a finite deposition rate is explored. We begin with an
equation of motion which includes, in addition to the disorder, the periodic
potential due to the discrete size of the particles (or to the lattice
structure of the... | 1994-09-21 | 2009-10-22 | [
"cond-mat"
] | Yan-Chr Tsai and Yonathan Shapir |
cond-mat/9409091 | Odd time magnetic correlations and chiral spin nematics | The magnetic analog of odd-time superconducting order is introduced. It is
shown that the classification of possible odd-time magnetic states admits the
existence of a novel state - the chiral spin nematic - which is characterized
by an odd-in-time spin-spin correlation function.The known example of the
chiral spin liq... | 1994-09-21 | 2009-10-22 | [
"cond-mat"
] | A.V. Balatsky and Elihu Abrahams |
cond-mat/9409090 | Semi-classical description of the frustrated antiferromagnetic chain | The antiferromagnetic Heisenberg model on a chain with nearest and next
nearest neighbor couplings is mapped onto the $SO(3)$ nonlinear sigma model in
the continuum limit. In one spatial dimension this model is always in its
disordered phase and a gap opens to excited states. The latter form a doubly
degenerate spin-1 ... | 1994-09-21 | 2009-10-22 | [
"cond-mat"
] | D. Allen and D. Senechal |
cond-mat/9409087 | Quantum Mesoscopic Scattering: Disordered Systems and Dyson Circular
Ensembles | We consider elastic reflection and transmission of electrons by a disordered
system characterized by a $2N\!\times\!2N$ scattering matrix $S$. Expressing
$S$ in terms of the $N$ radial parameters and of the four $N\!\times\!N$
unitary matrices used for the standard transfer matrix parametrization, we
calculate their pr... | 1994-09-21 | 2009-10-22 | [
"cond-mat"
] | Rodolfo A. Jalabert and Jean-Louis Pichard |
cond-mat/9409086 | Problem of a quantum particle in a random potential on a line revisited | The density of states for a particle moving in a random potential with a
Gaussian correlator is calculated exactly using the functional integral
technique. It is achieved by expressing the functional degrees of freedom in
terms of the spectral variables and the parameters of isospectral
transformations of the potential... | 1994-09-21 | 2009-10-22 | [
"cond-mat"
] | O.K.Vorov and A.V.Vagov |
cond-mat/9409092 | Critical exponents of a multicomponent anisotropic t-J model in one
dimension | A recently presented anisotropic generalization of the multicomponent
supersymmetric $t-J$ model in one dimension is investigated. This model of
fermions with general spin-$S$ is solved by Bethe ansatz for the ground state
and the low-lying excitations. Due to the anisotropy of the interaction the
model possesses $2S$ ... | 1994-09-21 | 2009-10-22 | [
"cond-mat"
] | R. Z. Bariev, A. Kl\"umper, A. Schadschneider and J. Zittartz |
cond-mat/9409085 | Phase Separation of Crystal Surfaces: A Lattice Gas Approach | We consider both equilibrium and kinetic aspects of the phase separation
(``thermal faceting") of thermodynamically unstable crystal surfaces into a
hill--valley structure. The model we study is an Ising lattice gas for a simple
cubic crystal with nearest--neighbor attractive interactions and weak
next--nearest--neighb... | 1994-09-21 | 2009-10-22 | [
"cond-mat"
] | Joel D. Shore and Dirk Jan Bukman |
cond-mat/9409082 | Ab initio Pseudopotential Plane-wave Calculations of the Electronic
Structure of YBa_2Cu_3O_7 | We present an ab initio pseudopotential local density functional calculation
for stoichiometric high-Tc cuprate YBa_2Cu_3O_7 using the plane-wave basis set.
We have overcome well-known difficulties in applying pseudopotential methods to
first-row elements, transition metals, and rare-earth materials by carefully
genera... | 1994-09-20 | 2009-10-22 | [
"cond-mat"
] | Hanchul Kim and Jisoon Ihm |
cond-mat/9409083 | Thermally Activated Deviations from Quantum Hall Plateaus | The Hall conductivity $\sigma_{\rm xy}$ of a two-dimensional electron system
is quantized in units of $e^2/h$ when the Fermi level is located in the
mobility gap between two Landau levels. We consider the deviation of
$\sigma_{\rm xy}$ from a quantized value caused by the thermal activation of
electrons to the extended... | 1994-09-20 | 2009-10-22 | [
"cond-mat"
] | M. M. Fogler and B. I. Shklovskii |
cond-mat/9409081 | Flicker Noise Induced by Dynamic Impurities in a Quantum Point Contact | We calculate low-frequency noise (LFN) in a quantum point contact (QPC) which
is electrostatically defined in a 2D electron gas of a GaAs-AlGaAs
heterostructure. The conventional source of LFN in such systems are scattering
potentials fluctuating in time acting upon injected electrons. One can
discriminate between pote... | 1994-09-20 | 2009-10-22 | [
"cond-mat"
] | J. P. Hessling and Yu. Galperin |
cond-mat/9409084 | Exact solution of a one-dimensional fermion model with interchain
tunneling | A fermion model consisting of two chains with interchain tunneling is
formulated and solved exactly by the Bethe ansatz method. The interchain
tunneling leads to Cooper pair like bound states and a threshold energy is
required to overcome the binding energy. The correlation functions manifest
superconducting properties... | 1994-09-20 | 2009-10-22 | [
"cond-mat"
] | R. Z. Bariev, A. Kl\"umper, A. Schadschneider, and J.Zittartz |
cond-mat/9409078 | The Role of Spin Anisotropy in the Unbinding of Interfaces | We study the ground state of a classical X-Y model with $p \ge 3$-fold spin
anisotropy $D$ in a uniform external field, $H$. An interface is introduced
into the system by a suitable choice of boundary conditions. For large $D$, as
$H \to 0$, we prove using an expansion in $D^{-1}$ that the interface unbinds
from the su... | 1994-09-19 | 2009-10-22 | [
"cond-mat"
] | C. Micheletti and J. M. Yeomans |
cond-mat/9409080 | Universal Cellular Automata and Class 4 | Wolfram has provided a qualitative classification of cellular automata(CA)
rules according to which, there exits a class of CA rules (called Class 4)
which exhibit complex pattern formation and long-lived dynamical activity (long
transients). These properties of Class 4 CA's has led to the conjecture that
Class 4 rules... | 1994-09-19 | 2015-06-25 | [
"cond-mat",
"hep-th"
] | Avinash Dhar, Porus Lakdawala, Gautam Mandal and Spenta R. Wadia |
cond-mat/9409094 | Geometrical Properties of Loops and Cluster Boundaries | We discuss how the statistical properties of the area and radius of gyration
of single self-avoiding loops, and of Ising and percolation cluster boundaries,
may be calculated using ideas of two-dimensional field theory. For cluster
boundaries, we show that almost all loops have area $C\ln L+O(1)$, where $L$ is
the size... | 1994-09-19 | 2007-05-23 | [
"cond-mat",
"hep-th"
] | John Cardy |
cond-mat/9409079 | Quantized Hall conductivity of Bloch electrons: topology and the Dirac
fermion | We consider the Hall conductivity of two-dimensional non-interacting Bloch
electrons when the magnetic flux per unit cell is a rational number $p/q$ where
$p$ and $q$ are mutually coprime. We present a counter-example for the naive
expectation that the Hall conductivity carried by a band is given by treating
gap minima... | 1994-09-19 | 2009-10-22 | [
"cond-mat"
] | Masaki Oshikawa |
cond-mat/9409076 | Existence of Long-Range Order in Quasi-Two-Dimensional Hubbard Model | In recent work of Monthoux and Pines~[1] and also in Rice et {\sl al.}'s
work~[2], quasi-averages like $\langle c_{k \uparrow} c_{- k \downarrow}
\rangle$ were considered even in the case of a dimension less or equal two. But
it is well known from the old work of Hohenberg~[3] that these quasi-averages
are zero at $T \... | 1994-09-19 | 2007-05-23 | [
"cond-mat"
] | A. Belkasri, J.L. Richard |
cond-mat/9409077 | Motion of a Single Hole in a Disordered Magnetic Background | The spectrum of a single hole is calculated within the spin-hole model using
a variational method. This calculation is done for any rotational invariant
magnetic background. We have found that when the magnetic background changes
from a disordered to a locally ordered state, the spectrum changes
qualitatively. We have ... | 1994-09-19 | 2015-06-25 | [
"cond-mat"
] | A. Belkasri, J.L. Richard |
cond-mat/9409075 | Finite Temperature Fractional Quantum Hall Effect | We investigate fractional quantum Hall effect at finite temperature using a
fermion Chern-Simons field theoretical approach. In the absence of impurity
scattering, the essential aspects of fractional quantum Hall effect, such as
the quantization of Hall conductance, as well as quasi-particle charge and
statistics are u... | 1994-09-18 | 2016-08-31 | [
"cond-mat"
] | Lizeng Zhang |
cond-mat/9409067 | Mean Field Behaviour in a Local Low-Dimensional Model | We point out a new mechanism which can lead to mean field type behaviour in
nonequilibrium critical phenomena. We demonstrate this mechanism on a
two-dimensional model which can be understood as a stochastic and
non-conservative version of the abelian sandpile model of Bak {\it et al.}
~\cite{bak}. This model has a sec... | 1994-09-16 | 2009-10-22 | [
"cond-mat"
] | Hans-Martin Broeker and Peter Grassberger |
cond-mat/9409069 | Is DLA Locally Isotropic or Self-Affine? | We present results of simulations which show unambiguously that DLA clusters
are not self-affine, in contrast to frequent claims. The measured observable is
the asymmetry of the last step of a walker before he sticks to the growing
cluster. Using deposition onto an originally straight line off lattice, we show
that thi... | 1994-09-16 | 2007-05-23 | [
"cond-mat"
] | Rainer Hegger and Peter Grassberger |
cond-mat/9409070 | Simulations of Single Polymer Chains in the Dense Limit | We present simulation results for single a-thermal chain polymers in finite
volumes. For this we use a recently proposed recursive implementation of the
enrichment method. In 3 dimensions it allows the simulation of extremely long
chains (up to $N=300,000$). It is much less efficient for $d=2$, but we can
also there ex... | 1994-09-16 | 2009-10-22 | [
"cond-mat"
] | Peter Grassberger and Rainer Hegger |
cond-mat/9409071 | Self Avoiding Walks in Four Dimensions: Logarithmic Corrections | We present simulation results for long ($N\leq 4000$) self-avoiding walks in
four dimensions. We find definite indications of logarithmic corrections, but
the data are poorly described by the asymptotically leading terms. Detailed
comparisons are presented with renormalization group flow equations derived in
direct ren... | 1994-09-16 | 2009-10-22 | [
"cond-mat"
] | Peter Grassberger, Rainer Hegger and Lothar Schaefer |
cond-mat/9409073 | Electronic Structure of Fibonacci Si Delta-Doped Gaas | We study the electronic structure of a new type of Fibonacci superlattice
based on Si $\delta$-doped GaAs. Assuming that $\delta$-doped layers are
equally spaced, quasiperiodicity is introduced by selecting two different donor
concentrations and arranging them according to the Fibonacci series along the
growth directio... | 1994-09-16 | 2015-06-25 | [
"cond-mat"
] | F. Dominguez-Adame, E. Macia, and B. Mendez |
cond-mat/9409074 | Criticality in Simple Models of Evolution | We consider two, apparently similar, models of biological evolution which
have been claimed to exhibit self-organized critical behaviour. A careful
reanalysis of these models, including several new analytic results for one of
them, suggests that they are qualitatively different. We demonstrate the
limitations of the me... | 1994-09-16 | 2009-10-22 | [
"cond-mat",
"q-bio"
] | Jan de Boer, A.D. Jackson, and Tilo Wettig |
cond-mat/9409072 | Master Equation for a Particle Coupled to a Two-Level Reservoir | We study the quantum dissipative dynamics of a particle coupled linearly to a
set of two-level systems (the heat bath) via the master equation method which
we extract from the path integral formalism independently from the form of the
bath spectral density. We compare our results with the standard models based on
boson... | 1994-09-16 | 2009-10-22 | [
"cond-mat"
] | Paulo C. Marques and Antonio H. Castro Neto |
cond-mat/9409066 | Critical behavior of nonequilibrium q-state systems | We present two classes of nonequilibrium models with critical behavior. Each
model is characterized by an integer $q>1$, and is defined on configurations of
$q$-valued spins on regular lattices. The definitions of the models are very
similar to the updating rules in Wolff's algorithm for the Potts model, but
both class... | 1994-09-16 | 2009-10-22 | [
"cond-mat"
] | Andrea Crisanti and Peter Grassberger |
cond-mat/9409068 | Are Damage Spreading Transitions Generically in the Universality Class
of Directed Percolation? | We present numerical evidence for the fact that the damage spreading
transition in the Domany-Kinzel automaton found by Martins {\it et al.} is in
the same universality class as directed percolation. We conjecture that also
other damage spreading transitions should be in this universality class, unless
they coincide wi... | 1994-09-16 | 2009-10-22 | [
"cond-mat"
] | Peter Grassberger |
cond-mat/9409064 | Surface critical behavior in fixed dimensions $d<4$: Nonanalyticity of
critical surface enhancement and massive field theory approach | The critical behavior of semi-infinite systems in fixed dimensions $d<4$ is
investigated theoretically. The appropriate extension of Parisi's massive field
theory approach is presented.Two-loop calculations and subsequent Pad\'e-Borel
analyses of surface critical exponents of the special and ordinary phase
transitions ... | 1994-09-15 | 2009-10-22 | [
"cond-mat"
] | H. W. Diehl and M. Shpot (U.Essen) |
cond-mat/9409063 | Enhancement of Persistent Current on Multichannel Ring | We study the effect of strong electron-electron interactions on the
persistent current in a multichannel ring with the aid of Bosonization and the
Bethe ansatz equation discussed by Sutherland and Tsvelik. The interaction acts
differently on a single and multichannel ring. If, in the first case, the
current is suppress... | 1994-09-15 | 2007-05-23 | [
"cond-mat"
] | F. V. Kusmartsev |
cond-mat/9409065 | The Doped Two Chain Hubbard Model | The properties of the two-chain Hubbard Model doped away from half-filling
are investigated. The charge gap is found to vanish, but a finite spin gap
exists over a range of interchain hopping strength $t_\perp$. In this range,
there are modified $d_{x^2-y^2}$--like pairing correlations whose strength is
correlated with... | 1994-09-15 | 2009-10-22 | [
"cond-mat"
] | R.M. Noack, S.R. White, and D.J. Scalapino |
cond-mat/9409054 | Spectral properties of charged particles in a classical finite
two-dimensional system | We present a study of the spectral properties like the energy spectrum, the
eigenmodes and density of states of a classical finite system of
two-dimensional (2D) charged particles which are confined by a quadratic
potential. Using the method of Newton optimization we obtain the ground state
and the metastable states. F... | 1994-09-14 | 2007-05-23 | [
"cond-mat"
] | V. A. Schweigert and F.M. Peeters |
cond-mat/9409062 | Modelization of Crack Growth in Brittle, Disordered Materials | The thesis consists of four main chapters. In Ch.2 we discuss experimental
results concerning the scaling behavior and fractality of fracture surfaces. In
Ch.3 continuum and discrete models for fracture mechanics are reviewed and
partially extended. In Ch.4 we present numerical results for a finite size
scaling of the ... | 1994-09-14 | 2007-05-23 | [
"cond-mat"
] | Frank Tzschichholz |
cond-mat/9409061 | Shape of domains in two-dimensional systems: virtual singularities and a
generalized Wulff construction | This is a report on the derivation and application of a generalized version
of the Wulff construction in two dimensions. The construction is used to find
the shape of a domain containing an XY-like order parameter. In such a domain
the energy per unit length of a segment of the bounding curve depends not only
on the or... | 1994-09-14 | 2009-10-22 | [
"cond-mat"
] | Joseph Rudnick and Robijn Bruinsma |
cond-mat/9409056 | Upper critical field in the gauge model | An analysis of the upper critical field in the gauge model is presented. It
is shown that a `strange metallic' normal state has implications for the
pairing transition even if the resulting superconducting state is essentially
conventional. The gauge model is considered as one example of an unconventional
normal state ... | 1994-09-14 | 2009-10-22 | [
"cond-mat"
] | A.J. Schofield |
cond-mat/9409059 | Analytic Solution of Emden-Fowler Equation and Critical Adsorption in
Spherical Geometry | In the framework of mean-field theory the equation for the order-parameter
profile in a spherically-symmetric geometry at the bulk critical point reduces
to an Emden-Fowler problem. We obtain analytic solutions for the surface
universality class of extraordinary transitions in $d=4$ for a spherical shell,
which may ser... | 1994-09-14 | 2009-10-22 | [
"cond-mat"
] | S. Gnutzmann and U. Ritschel |
cond-mat/9409055 | Landau Level Gap Reduction at Abrupt Edges | For an electron localized near a finite rectangular step potential under
strong magnetic field we found a profound local reduction of the gap between
neighbouring Landau levels. We investigate under what conditions the effect
persists when the barrier gets smoother. The conclusion is that to get a
substantial gap reduc... | 1994-09-14 | 2015-06-25 | [
"cond-mat"
] | I.Bartos and B.Rosenstein |
cond-mat/9409060 | Exact diagonalisation studies of strongly correlated 2D lattice fermions | The T=0 phase diagram of the planar t--J model with small doping is
investigated by exact diagonalisations of square clusters with up to 32 sites.
At half-filling, the single hole quasi-particule weight vanishes in the strong
correlation limit $J\rightarrow 0$ while the quasi-particle mass diverges (like
1/J). However,... | 1994-09-14 | 2009-10-22 | [
"cond-mat"
] | Didier Poilblanc |
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