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/9307037 | Formula for the widths of quantum-Hall-effect plateaus | We derive an empirical formula for the width of quantum Hall effect plateaus
which is free of adjustable parameters. It describes the integer, fractional
and $\nu = 0$ (Wigner insulator) quantum Hall effect in single heterojunctions.
The temperature scale of the existence of these three phenomena is the same as
the mel... | 1993-07-19 | 2007-05-23 | [
"cond-mat"
] | Atanas Groshev |
cond-mat/9307036 | Comparison of Variational Approaches for the Exactly Solvable
1/r-Hubbard Chain | We study Hartree-Fock, Gutzwiller, Baeriswyl, and combined
Gutzwiller-Baeriswyl wave functions for the exactly solvable one-dimensional
$1/r$-Hubbard model. We find that none of these variational wave functions is
able to correctly reproduce the physics of the metal-to-insulator transition
which occurs in the model for... | 1993-07-19 | 2009-10-22 | [
"cond-mat"
] | Florian Gebhard and Andreas Girndt, (Dept.of Physics and Materials
Sciences Center, Philipps University, 35032~Marburg, Germany) |
cond-mat/9307039 | Disordered Bosons: Condensate and Excitations | The disordered Bose Hubbard model is studied numerically within the
Bogoliubov approximation. First, the spatially varying condensate wavefunction
in the presence of disorder is found by solving a nonlinear Schrodinger
equation. Using the Bogoliubov approximation to find the excitations above this
condensate, we calcul... | 1993-07-19 | 2009-10-22 | [
"cond-mat"
] | K.G. Singh, D.S. Rokhsar |
cond-mat/9307038 | Density of states and magnetic susceptibilities on the octagonal tiling | We study electronic properties as a function of the six types of local
environments found in the octagonal tiling. The density of states has six
characteristic forms, although the detailed structure differs from site to site
since no two sites are equivalent in a quasiperiodic tiling. We present the
site-dependent magn... | 1993-07-19 | 2009-10-22 | [
"cond-mat"
] | A. Jagannathan |
cond-mat/9307035 | A Vectorized Algorithm for Molecular Dynamics of Short Range Interacting
Particles | We report on a lattice based algorithm, completely vectorized for molecular
dynamics simulations. Its algorithmic complexity is of the order O(N), where
$N$ is the number of particles. The algorithm works very effectively when the
particles have short range interaction, but it is applicable to each kind of
interaction.... | 1993-07-18 | 2009-10-22 | [
"cond-mat"
] | V.Buchholtz and T.Poeschel |
cond-mat/9307034 | Path Integral Monte Carlo Study of a Model 2D Quantum Paraelectric | We have begun a study of quantum ferroelectrics and paraelectrics. Simple 2D
short-range lattice model hamiltonians are constructed, keeping in mind the
phenomenology of real perovskite systems, like $SrTiO_{3}$ and $KTaO_{3}$.
Pertinent quantum tunneling phenomena, and the presence of an ice-like
constraint are demons... | 1993-07-17 | 2016-08-14 | [
"cond-mat"
] | R. Marto\v{n}\'ak and E. Tosatti |
cond-mat/9307032 | Gutzwiller wavefunction in the three-band Hubbard model: A variational
Monte Carlo study | The Gutzwiller wave function for the three-band Hubbard model on a two
dimensional CuO$_2$ plane is studied by using the variational Monte Carlo (VMC)
method in the limit $U_d \to \infty$, where $U_d$ is the Coulomb repulsion
between holes on a Cu site. The VMC results for the energy and the fraction of
$d$-holes are c... | 1993-07-17 | 2009-10-22 | [
"cond-mat"
] | A.Oguri, T.Asahta, and S.Maekawa |
cond-mat/9307033 | Ultraviolet and soft X--ray photon--photon elastic scattering in an
electron gas | We have considered the processes which lead to elastic scattering between two
far ultraviolet or X--ray photons while they propagate inside a solid, modeled
as a simple electron gas. The new ingredient, with respect to the standard
theory of photon--photon scattering in vacuum, is the presence of low--energy,
nonrelati... | 1993-07-17 | 2016-08-14 | [
"cond-mat"
] | R. Marto\v{n}\'ak and E. Tosatti |
cond-mat/9307031 | The Shape of Bucky Onions | The morphology of Bucky onions is investigated by {\it ab initio}
calculations using Yang's new $O(N)$ method. It is found that for large single
shell fullerenes with $I_h$ symmetry, the spherical morphology has the lower
energy than that of polyhedrons. The formation energy per atom follows a simple
scaling law. Inclu... | 1993-07-15 | 2007-05-23 | [
"cond-mat"
] | Jian Ping Lu (Department of Physics and Astronomy, University of North
Carolina at Chapel Hill, Chapel Hill, North Carolina Weitao Yang, Department
of Chemistry, Duke University, Durham, NC) |
cond-mat/9307027 | On U_q(SU(2))-symmetric Driven Diffusion | We study analytically a model where particles with a hard-core repulsion
diffuse on a finite one-dimensional lattice with space-dependent, asymmetric
hopping rates. The system dynamics are given by the
\mbox{U$_{q}$[SU(2)]}-symmetric Hamiltonian of a generalized anisotropic
Heisenberg antiferromagnet. Exploiting this s... | 1993-07-14 | 2009-10-22 | [
"cond-mat"
] | Sven Sandow and Gunter Schuetz |
cond-mat/9309005 | Crossover Behavior on Restricted Surface Depositions | We study the crossover behavoir on restricted surface depostions. | 1993-07-14 | 2008-02-03 | [
"cond-mat"
] | Younggi Lee and In-Mook Kim |
cond-mat/9307030 | Growth Kinetics in Systems with Local Symmetry | The phase transition kinetics of Ising gauge models are investigated. Despite
the absence of a local order parameter, relevant topological excitations that
control the ordering kinetics can be identified. Dynamical scaling holds in the
approach to equilibrium, and the growth of typical length scale is
characteristic of... | 1993-07-14 | 2009-10-22 | [
"cond-mat"
] | Fong Liu |
cond-mat/9307028 | Matrix-product-groundstates for one-dimensional spin-1 quantum
antiferromagnets | We have found the exact groundstate for a large class of antiferromagnetic
spin-1 models with nearest-neighbour interactions on a linear chain. All
groundstate properties can be calculated. The groundstate is determined as a
matrix product of individual site states and has the properties of the Haldane
scenario. | 1993-07-14 | 2009-10-22 | [
"cond-mat"
] | A. Kl\"umper, A. Schadschneider and J. Zittartz |
cond-mat/9307026 | Dynamics of Toom interface in three dimensions | We introduce a novel three dimensional Toom model on bcc lattice, and study
its physical properties. In low-noise limit, the model leads to an effective
solid-on-solid-type model, which exhibits a stationary interface via
depositions and evaporations with avalanche process. We find that the model is
described by the Ed... | 1993-07-14 | 2009-10-22 | [
"cond-mat"
] | H. Jeong, B. Kahng, D. Kim |
cond-mat/9307023 | Mean Field Renormalization Group for the Boundary Magnetization of Strip
Clusters | We analyze in some detail a recently proposed transfer matrix mean field
approximation which yields the exact critical point for several two dimensional
nearest neighbor Ising models. For the square lattice model we show explicitly
that this approximation yields not only the exact critical point, but also the
exact bou... | 1993-07-13 | 2009-10-22 | [
"cond-mat"
] | A. Pelizzola and A. Stella |
cond-mat/9307024 | Theory of Adsorption and Surfactant Effect of Sb on Ag (111) | We present first-principles studies of the adsorption of Sb and Ag on clean
and Sb-covered Ag (111). For Sb, the {\it substitutional} adsorption site is
found to be greatly favored with respect to on-surface fcc sites and to
subsurface sites, so that a segregating surface alloy layer is formed. Adsorbed
silver adatoms ... | 1993-07-13 | 2009-10-22 | [
"cond-mat"
] | Sabrina Oppo, Vincenzo Fiorentini, and Matthias Scheffler
(Fritz-Haber-Institut der MPG, Berlin, Germany) |
cond-mat/9307025 | Atomic and Molecular Impurities in $^4$He Clusters | A density functional theory is used to predict the binding energy of atomic
and molecular impurities (Ne, Ar, Kr, Xe, Li, Na, K, Rb, Cs, and SF$_6$) in the
center of $^4$He clusters, in the limit of zero temperature and for zero
angular momentum states. The size dependence of the binding energy, from small
clusters to ... | 1993-07-13 | 2009-10-22 | [
"cond-mat"
] | F.Dalfovo |
cond-mat/9307019 | Spectrum of Low-Lying Excitations in a Supersymmetric Extended Hubbard
Model | We continue the study of the $u(2|2)$-supersymmetric extension of the Hubbard
model in one dimension. We determine the excitation spectrum at zero
temperature even in the sectors where the ground states are
$u(2|2)$-descendants of Bethe states. The excitations include spinons, holons,
electrons, localons (local electro... | 1993-07-12 | 2015-06-25 | [
"cond-mat"
] | Fabian H.L. Essler and Vladimir E. Korepin |
cond-mat/9307020 | Dissipation of the 3^He A-B Transition | A rigorous hydrodynamic theory of the A-B transition is presented. All
dissipative processes are considered. At low interface velocities, those
occurring on hydrodynamic length scales, not considered hitherto, are most
probably the dominant ones. | 1993-07-12 | 2009-10-22 | [
"cond-mat"
] | Peter Kostaedt and Mario Liu |
cond-mat/9307022 | Rossby Waves in the Quantum Hall effect | This paper is incorrect, and has been withdrawn by the author. | 1993-07-12 | 2008-02-03 | [
"cond-mat"
] | Michael Stone |
cond-mat/9307021 | Critical Exponents for the SC-Model in the Zero Sector | In this paper, we continue our investigation of a one-dimensional,
two-component, quantum many-body system in which like particles interact with a
pair potential $s(s+1)/{\rm sinh}^{2}(r)$, while unlike particles interact with
a pair potential $-s(s+1)/{\rm cosh}^{2}(r)$. For an equal number of particles
of the two com... | 1993-07-12 | 2016-08-14 | [
"cond-mat"
] | Rudolf A. R\"omer and Bill Sutherland |
cond-mat/9307018 | Chiral exponents of the square-lattice frustrated XY model: a Monte
Carlo transfer-matrix calculation | Thermal and chiral critical exponents of the fully frustrated XY model on a
square-lattice are obtained from a finite-size scaling analysis of the free
energy of chiral domain walls. Data were obtained by extensive Monte Carlo
transfer matrix computations for infinite strips of widths up to $14$ lattice
spacings. Two t... | 1993-07-11 | 2009-10-22 | [
"cond-mat"
] | E. Granato and M.P. Nightingale |
cond-mat/9307017 | Lattice Boltzmann Models for Complex Fluids | We present various Lattice Boltzmann Models which reproduce the effects of
rough walls, shear thinning and granular flow. We examine the boundary layers
generated by the roughness of the walls. Shear thinning produces plug flow with
a sharp density contrast at the boundaries. Density waves are spontaneously
generated w... | 1993-07-10 | 2009-10-22 | [
"cond-mat"
] | E.G. Flekkoy and H.J. Herrmann |
cond-mat/9307015 | Eutectic point in a simple lattice gas model | We investigate the phase diagram and the critical properties of the adsorbate
system sulphur/ruthenium(0001) in the coverage region $\frac{1}{4} < \Theta <
\frac{1}{3}$ by means of Monte-Carlo simulations of a simple lattice gas model
on a triangular lattice. The model contains only repulsive nearest and
next-nearest n... | 1993-07-09 | 2007-05-23 | [
"cond-mat"
] | M. Sandhoff, H. Pfnuer and H.U. Everts |
cond-mat/9307016 | On adiabatic turn-on and the asymptotic limit in linear response theory
for open systems | Linear response theory for open (infinite) systems leads to an expression for
the current response which contains surface terms in addition to the usual bulk
Kubo term. We show that this surface term vanishes identically if the correct
order of limits is maintained in the derivation: the system size, L, must be
taken t... | 1993-07-09 | 2007-05-23 | [
"cond-mat"
] | Jens U. Noeckel, A. Douglas Stone and Harold U. Baranger |
cond-mat/9307013 | Effective Theory of a Chiral Superfluid | We consider an effective Lagrangian describing a fluid living on
two-di\-men\-sio\-nal planes. The fluid self-interacts through a Chern-Simons
vector potential, whose field strength is proportional to the density
fluctuation. This effective Lagrangian can be related to the Anyon mean field,
but can also be considered m... | 1993-07-08 | 2009-10-22 | [
"cond-mat",
"hep-th"
] | Pietro Donatis and Roberto Iengo |
cond-mat/9307012 | Macroscopic Quantum Tunneling of a Domain Wall in a Ferromagnetic Metal | The macroscopic quantum tunneling of a planar domain wall in a ferromagnetic
metal is studied based on the Hubbard model. It is found that the ohmic
dissipation is present even at zero temperature due to the gapless Stoner
excitation, which is the crucial difference from the case of the insulating
magnet. The dissipati... | 1993-07-08 | 2009-10-22 | [
"cond-mat"
] | Gen Tatara and Hidetoshi Fukuyama (Department of Physics, University
of Tokyo, 7-3-1 Hongo, Tokyo 113, Japan) |
cond-mat/9307014 | Quantum Disordered Regime and Spin Gap in the Cuprate Superconductors | We discuss the crossover from the quantum critical, $z\!=\!1$, to the quantum
disordered regime in high-T$_c$ materials in relation to the experimental data
on the nuclear relaxation, bulk susceptibility, and inelastic neutron
scattering. In our scenario, the spin excitations develop a gap
$\Delta\!\sim\!1/\xi$ well ab... | 1993-07-08 | 2009-10-22 | [
"cond-mat"
] | V. Barzykin, D. Pines, A. Sokol, and D. Thelen |
cond-mat/9307011 | Phase diagram of the bose Hubbard model | The first reliable analytic calculation of the phase diagram of the bose gas
on a $d$-dimensional lattice with on-site repulsion is presented. In one
dimension, the analytic calculation is in excellent agreement with the
numerical Monte Carlo results. In higher dimensions, the deviations from the
Monte Carlo calculatio... | 1993-07-08 | 2009-10-22 | [
"cond-mat"
] | J. K. Freericks and H. Monien |
cond-mat/9307009 | Renormalization Group Approach to Interacting Fermions | The stability of nonrelativistic fermionic systems to interactions is studied
within the Renormalization Group framework. A brief introduction to $\phi^4$
theory in four dimensions and the path integral formulation for fermions is
given. The strategy is as follows. First, the modes on either side of the Fermi
surface w... | 1993-07-07 | 2009-10-22 | [
"cond-mat",
"hep-th"
] | R.Shankar |
cond-mat/9307010 | Feedback Effects in Superconductors | We calculate corrections to the BCS gap equation caused by the interaction of
electrons with the collective phase and amplitude modes in the superconducting
state. This feedback reduces the BCS gap parameter, $\Delta$, and leaves the
critical temperature, $T_c$, unchanged. The feedback effect is proportional to
$(\Delt... | 1993-07-07 | 2009-10-22 | [
"cond-mat"
] | Tony Gherghetta and Yoichiro Nambu |
cond-mat/9307007 | Nonlinear Optical Response of C60 Molecules | The third-order nonlinear optical susceptiblity chi(3) of a C60 molecule is
calculated by using a free-electron model as well as by taking Coulomb
interactions into account. The free-electron model yields chi(3) magnitudes
which are in agreement with experiment. Althugh Coulomb interactions reduce
chi(3) by one order o... | 1993-07-06 | 2007-05-23 | [
"cond-mat"
] | Kikuo Harigaya (1,2) and Shuji Abe (1), ((1) Elecrotechnical
Laboratory, Umezono, Tsukuba, Ibaraki, Japan, (2) Department of Physics,
University of Sheffield, United Kingdom) |
cond-mat/9307008 | Grain Boundary Buckling and Spin Glass Models of Disorder in Membranes | A systematic investigation is presented of grain boundaries and grain
boundary networks in two dimensional flexible membranes with crystalline order.
An isolated grain boundary undergoes a buckling transition at a critical value
of the elastic constants, but, contrary to previous findings, the shape of the
buckled memb... | 1993-07-06 | 2009-10-22 | [
"cond-mat"
] | Carlo Carraro and David R. Nelson |
cond-mat/9307006 | Flux flow dissipation in superconductors with short coherence length | In superconductors where the coherence length is comparable to the Fermi
wavelength, the electronic levels within a vortex core are quantized, and
separated by energies of the order of the superconducting gap. The absence of a
continuum modifies significantly the energy dissipation due to the motion of
vortices. At zer... | 1993-07-05 | 2007-05-23 | [
"cond-mat"
] | F. Guinea and Yu. Pogorelov |
cond-mat/9307003 | Flory theory revisited | The Flory theory for a single polymer chain is derived as the lowest order of
a cumulant expansion. In this approach, the full original Flory free energy
(including the logarithmic term), is recovered. %This term does not change the
wandering exponent $ \nu $ but turns out to %be responsible for the crossover
from Brow... | 1993-07-02 | 2009-10-22 | [
"cond-mat"
] | H. Orland |
cond-mat/9307005 | Bosonization of Fermi liquids | We bosonize a Fermi liquid in any number of dimensions in the limit of long
wavelengths. From the bosons we construct a set of coherent states which are
related with the displacement of the Fermi surface due to particle-hole
excitations. We show that an interacting hamiltonian in terms of the original
fermions is quadr... | 1993-07-02 | 2009-10-22 | [
"cond-mat",
"hep-th",
"nucl-th"
] | A.H.Castro Neto and Eduardo Fradkin |
cond-mat/9307004 | Non-Gaussian Distributions in Extended Dynamical Systems | We propose a novel mechanism for the origin of non-Gaussian tails in the
probability distribution functions (PDFs) of local variables in nonlinear,
diffusive, dynamical systems including passive scalars advected by chaotic
velocity fields. Intermittent fluctuations on appropriate time scales in the
amplitude of the (ch... | 1993-07-02 | 2009-10-22 | [
"cond-mat"
] | Ravi Bhagavatula and C. Jayaprakash |
cond-mat/9307001 | Evidence of aging in mean-field spin glass models | We study numerically the out of equilibrium dynamics of the hypercubic cell
spin glass in high dimensionalities. We obtain evidence of aging effects
qualitatively similar both to experiments and to simulations of low dimensional
models. This suggests that the Sherrington-Kirkpatrick model as well as other
mean-field fi... | 1993-07-01 | 2009-10-22 | [
"cond-mat"
] | L. F. Cugliandolo, J. Kurchan and F. Ritort |
cond-mat/9307002 | Buckling Instabilities of a Confined Colloid Crystal Layer | A model predicting the structure of repulsive, spherically symmetric,
monodisperse particles confined between two walls is presented. We study the
buckling transition of a single flat layer as the double layer state develops.
Experimental realizations of this model are suspensions of stabilized colloidal
particles sque... | 1993-07-01 | 2009-10-22 | [
"cond-mat"
] | T Chou and David R. Nelson |
cond-mat/9306062 | A Simple Geometrical Model for Solid Friction | We present a simple model for the friction of two solid bodies moving against
each other. In a self consistent way we can obtain the dependence of the
macroscopic friction force as a function of the driving velocity, the normal
force and the ruggedness of the surfaces in contact. Our results are discussed
in the contex... | 1993-06-30 | 2009-10-22 | [
"cond-mat"
] | T. Poeschel and H.J. Herrmann |
cond-mat/9306060 | Quantum Vortices Near the Superconductor-Insulator Transition in
Josephson Junction Arrays | The properties of vortices in Josephson junction arrays are investigated in
the quantum regime near the superconductor-insulator transition. We derive and
study an effective action for vortex dynamics that is valid in the region where
the charging energy is comparable to the Josephson coupling energy. In the
supercondu... | 1993-06-30 | 2009-10-22 | [
"cond-mat"
] | Anne van Otterlo and Rosario Fazio |
cond-mat/9306061 | Bubble Growth in Superfluid 3-He: The Dynamics of the Curved A-B
Interface | We study the hydrodynamics of the A-B interface with finite curvature. The
interface tension is shown to enhance both the transition velocity and the
amplitudes of second sound. In addition, the magnetic signals emitted by the
growing bubble are calculated, and the interaction between many growing bubbles
is considered... | 1993-06-30 | 2012-07-23 | [
"cond-mat"
] | Jens Johannesson and Mario Liu |
cond-mat/9306059 | Mean Field Theory for Underdamped Josephson Junction Arrays with an
Offset Voltage | We study a model Hamiltonian for superconductivity in underdamped Josephson
junction arrays in the presence of an offset voltage between the array and the
substrate. We develop an approximate zero-temperature (T = 0) phase diagram as
a function of Josephson coupling, charging energy, and offset voltage, using a
simple ... | 1993-06-29 | 2009-10-22 | [
"cond-mat"
] | Eric Roddick and David Stroud |
cond-mat/9306058 | Is There Another Scale in the Fractional Quantum Hall Effect ? | We reanalyse theoretical considerations and experimental data, in an attempt
to decide hether there is another scale in the fractional quantum Hall effect
problem, in addition to the magnetic scale defined by the magnetic length $a_c$
or the cyclotron energy $\hbar \omega_c$. We then discuss possible implications
of a ... | 1993-06-28 | 2007-05-23 | [
"cond-mat"
] | R. Brako and \v{z}. Crljen |
cond-mat/9306056 | Superconductivity in the Two-Band Hubbard Model in Infinite D: an Exact
Diagonalization Study | We apply an exact diagonalization method to the the infinite-D two-band
Hubbard model. The method is essentially exact for the calculation of
thermodynamic properties for all but the smallest frequencies and yields a
resolution unavailable in Monte Carlo calculations. We establish the
instability of the normal state wi... | 1993-06-28 | 2007-05-23 | [
"cond-mat"
] | Werner Krauth and Michel Caffarel |
cond-mat/9306057 | Exact Diagonalization Approach for the infinite D Hubbard Model | We present a powerful method for calculating the thermodynamic properties of
the Hubbard model in infinite dimensions, using an exact diagonalization of an
Anderson model with a finite number of sites. At finite temperatures, the
explicit diagonalization of the Anderson Hamiltonian allows the calculation of
Green's fun... | 1993-06-28 | 2007-05-23 | [
"cond-mat"
] | Michel Caffarel and Werner Krauth |
cond-mat/9306055 | Effective Action and Renormalization Group Flow of Anisotropic
Superconductors | We calculate the effective action of a superconductor, without assuming that
either the electron-electron potential or the Fermi surface obey rotational
invariance. This approach leads to the same gap equation and equilibrium free
energy as more conventional methods. The results are used to obtain the
Gell-Mann - Low r... | 1993-06-27 | 2009-10-22 | [
"cond-mat",
"hep-th"
] | Steven Weinberg |
cond-mat/9306054 | Interatomic potentials from first-principles calculations: the
force-matching method | We present a new scheme to extract numerically ``optimal'' interatomic
potentials from large amounts of data produced by first-principles
calculations. The method is based on fitting the potential to ab initio atomic
forces of many atomic configurations, including surfaces, clusters, liquids and
crystals at finite temp... | 1993-06-26 | 2009-10-22 | [
"cond-mat"
] | Furio Ercolessi and James B. Adams |
cond-mat/9306052 | Density Waves in the Flows of Granular Media | We study density waves in the flows of granular particles through vertical
tubes and hoppers using both analytic methods and molecular dynamics (MD)
simulations. We construct equations of motion for quasi one-dimensional
systems. The equations, combined with the Bagnold's law for friction, are used
to describe the time... | 1993-06-24 | 2016-08-14 | [
"cond-mat"
] | Jysoo Lee (HLRZ-KFA J\"ulich, Germany) |
cond-mat/9306053 | Finite-Temperature Elasticity Phase Transition in Decaconal
Quasicrystals | We present evidence for a novel finite-temperature phase transition in the
phason elasticity of quasicrystals. A tiling model for energetically stabilized
decagonal quasicrystals has been studied in an extensive series of Monte Carlo
simulation. Hamiltonian (energetics) of the model is given by nearest-neighbor
Penrose... | 1993-06-24 | 2007-05-23 | [
"cond-mat"
] | Hyeong-Chai Jeong and Paul J. Steinhardt |
cond-mat/9306051 | Existence of the LOFF State in Superconducting UPd_2Al_3 | In a recent Letter, Gloos et al have suggested that the heavy fermion
superconductor, UPd_2Al_3, has a transition in magnetic field from the normal
state to an inhomogeneous superconducting state, known as the LOFF state,
followed at lower fields by a first order phase transition to the usual flux
lattice state. To inv... | 1993-06-23 | 2009-10-22 | [
"cond-mat"
] | M. R. Norman |
cond-mat/9306050 | Nonlinear Transport Properties of Quantum Dots | The influence of excited levels on nonlinear transport properties of a
quantum dot weakly coupled to leads is studied using a master--equation
approach. A charging model for the dot is compared with a quantum mechanical
model for interacting electrons. The current--voltage curve shows Coulomb
blockade and additional fi... | 1993-06-23 | 2009-10-22 | [
"cond-mat"
] | W. Pfaff, D. Weinmann, W. Haeusler, B. Kramer, U. Weiss, PTB
Braunschweig (Institut for theoretical physics, Univ. Stuttgart) |
cond-mat/9306049 | An Improvement on the Negative Sign Problem in Numerical Calculations of
a Quantum Spin System | We propose new approach to numerical study of quantum spin systems. Our
method is based on a fact that one can use any set of states for the path
integral as long as it is complete. We apply our method to one-dimensional
quantum spin system with next-to-nearest neighbor interactions. We found
remarkable improvement in ... | 1993-06-23 | 2009-10-22 | [
"cond-mat"
] | Tomo Munehisa and Yasuko Munehisa |
cond-mat/9306048 | Influence of Gap Extrema on the Tunneling Conductance Near an Impurity
in an Anisotropic Superconductor | Changes: figures added in postscript form, Eq. (7) and various typos
corrected. We examine the effect of an impurity on the nearby tunneling
conductance in an anisotropically-gapped superconductor. The variation of the
conductance has pronounced spatial dependence which depends strongly on the
Fermi surface location of... | 1993-06-22 | 2009-10-22 | [
"cond-mat"
] | J.M. Byers, M.E. Flatte', D.J. Scalapino |
cond-mat/9306047 | Surfactant-Mediated Growth of Nonequilibrium Interfaces | A number of recent experiments have showed that surfactants can modify the
growth mode of an epitaxial film, suppressing islanding and promoting
layer-by-layer growth. Here I introduce a set of coupled equations to describe
the nonequilibrium roughening of an interface covered with a thin surfactant
layer. The surfacta... | 1993-06-22 | 2009-10-22 | [
"cond-mat"
] | Albert-L\'aszl\'o Barab\'asi |
cond-mat/9306044 | The s=1/2 Heisenberg Antiferromagnet on the Triangular Lattice: Exact
Results and Spin-Wave Theory for Finite Cells | We study the ground state properties of the S=$\frac{1}{2}$ Heisenberg
antiferromagnet (HAF) on the triangular lattice with nearest-neighbour ($J$)
and next-nearest neighbour ($\alpha J$) couplings. Classically, this system is
known to be ordered in a $120^\circ$ N\'eel type state for values
$-\infty<\alpha\le 1/8$ of ... | 1993-06-21 | 2009-10-22 | [
"cond-mat"
] | R. Deutscher and H.U. Everts |
cond-mat/9306046 | Odd Parity Superconductivity in Heavy Fermion UPd_2Al_3 | The simple argument given in the previous version "that almost certainly
restricts heavy fermion UPd_2Al_3 to be an odd parity superconductor with a
single component order parameter" is not correct. | 1993-06-21 | 2008-02-03 | [
"cond-mat"
] | M. R. Norman |
cond-mat/9306045 | Heisenberg models and a particular isotropic model | The Heisenberg model, a quantum mechanical analogue of the Ising model, has a
large ground state degeneracy, due to the symmetry generated by the total spin.
This symmetry is also responsible for degeneracies in the rest of the spectrum.
We discuss the global structure of the spectrum of Heisenberg models with
arbitrar... | 1993-06-21 | 2009-10-22 | [
"cond-mat"
] | A.J. van der Sijs (University of Oxford) |
cond-mat/9306043 | Twisted Line Liquids | We propose a model of directed lines where the average direction has the
nature of a cholesteric liquid crystal. This model, for instance, would
describe the liquid of screw dislocations in the twist-grain-boundary (TGB)
phase of liquid crystals. We show that the presence of lines does not alter the
long wavelength ela... | 1993-06-19 | 2009-10-22 | [
"cond-mat"
] | Randall D. Kamien and T.C. Lubensky |
cond-mat/9306042 | Critical Point Field Mixing in an Asymmetric Lattice Gas Model | The field mixing that manifests broken particle-hole symmetry is studied for
a 2-D asymmetric lattice gas model having tunable field mixing properties.
Monte Carlo simulations within the grand canonical ensemble are used to obtain
the critical density distribution for different degrees of particle-hole
asymmetry. Excep... | 1993-06-19 | 2009-10-22 | [
"cond-mat"
] | N.B. Wilding |
cond-mat/9306041 | Tunneling in One-Dimensional non-Luttinger Electron Liquid | The conductance of a weakly interacting electron gas in the presense of a
single scatterer is found at arbitrary strength of the scattering potential. At
weak interaction, a simple renormalization group approach can be used instead
of the standard bosonization procedure. Our technique allows to take into
account the {\... | 1993-06-18 | 2009-10-22 | [
"cond-mat"
] | K. A. Matveev, Dongxiao Yue, and L. I. Glazman |
cond-mat/9306040 | Fermi-Edge Singularity with Backscattering in the Luttinger-Liquid Model | We study the response of the interacting electron gas in one dimension on the
local external potential. In the low frequency limit the power-law
singularities are essentially modifyed by backscattering effects which, in the
case of zero forward scattering, result in the universal critical exponent
depending only on the... | 1993-06-17 | 2009-10-22 | [
"cond-mat"
] | N. V. Prokof'ev |
cond-mat/9306038 | Electron--Electron Scattering in Quantum Wires and it's Possible
Suppression due to Spin Effects | A microscopic picture of electron-electron pair scattering in single mode
quantum wires is introduced which includes electron spin. A new source of
`excess' noise for hot carriers is presented. We show that zero magnetic field
`spin' splitting in quantum wires can lead to a dramatic `spin'-subband
dependence of electro... | 1993-06-17 | 2009-10-22 | [
"cond-mat"
] | Gerhard Fasol and Hiroyuki Sakaki |
cond-mat/9306039 | Neural networks with high order connections | We present results for two different kinds of high order connections between
neurons acting as corrections to the Hopfield model. Equilibrium properties are
analyzed using the replica mean-field theory and compared with numerical
simulations. An optimal learning algorithm for fourth order connections is
given that impr... | 1993-06-17 | 2009-10-22 | [
"cond-mat",
"q-bio.NC"
] | J.J. Arenzon and R.M.C. de Almeida |
cond-mat/9306037 | Comment on "Theory of Impure Superconductors: Anderson versus Abrikosov
and Gor'kov" | In a recent article, Kim and Overhauser [Phys. Rev. B 47, 8025 (1993)] have
found fault with the theory of impure superconductors by Abrikosov and Gor'kov
and have proposed an alternative formalism based on Green's functions which are
not derivable from a Dyson equation. Although the corrections to the
Abrikosov-Gor'ko... | 1993-06-16 | 2007-05-23 | [
"cond-mat"
] | R. J. Radtke |
cond-mat/9306036 | Large-Scale Numerical Evidence for Bose Condensation in the S=1
Antiferromagnetic Chain in a Strong Field | Using the recently proposed density matrix renormalization group technique we
show that the magnons in the S=1 antiferromagnetic Heisenberg chain effectively
behaves as bosons that condense at a critical field h_c. | 1993-06-16 | 2009-10-22 | [
"cond-mat"
] | E. S. Sorensen and I. Affleck |
cond-mat/9306033 | Charging Effects in Ultrasmall Quantum Dots in the Presence of
Time-Varying Fields | The influence of charging effects on time-dependent transport in small
semiconductor quantum dots with arbitrary level spectra is studied. Starting
from an explicit time-dependent tunneling Hamiltonian, a non-Markovian Master
equation is derived which is also valid in the nonlinear response regime. The
many-body nonequ... | 1993-06-15 | 2009-10-22 | [
"cond-mat"
] | C. Bruder and H. Schoeller |
cond-mat/9306035 | Correlations between Aharonov-Bohm effects and one-dimensional subband
populations in GaAs/Al$_{x}$Ga$_{1-x}$As rings | The Aharonov-Bohm (AB) interference patterns in ring-shaped conductors are
usually dominated by random features. The amplitude of the oscillations is
random from sample to sample and from point to point on the magnetic field axis
owing to random scattering of the electron trajectories by impurities within
the wires. We... | 1993-06-15 | 2009-10-22 | [
"cond-mat"
] | J. Liu, W.X. Gao, K.Ismail, K.Y. Lee, J.M. Hong, S. Washburn |
cond-mat/9306034 | Locally Frozen Defects in Random Sequential Adsorption with Diffusional
Relaxation | Random sequential adsorption with diffusional relaxation, of two by two
square objects on the two-dimensional square lattice is studied by Monte Carlo
computer simulation. Asymptotically for large lattice sizes, diffusional
relaxation allows the deposition process to reach full coverage. The coverage
approaches the ful... | 1993-06-15 | 2010-10-12 | [
"cond-mat"
] | Jian-Sheng Wang, Peter Nielaba and Vladimir Privman |
cond-mat/9306032 | Optimal storage capacity of neural networks at finite temperatures | Gardner's analysis of the optimal storage capacity of neural networks is
extended to study finite-temperature effects. The typical volume of the space
of interactions is calculated for strongly-diluted networks as a function of
the storage ratio $\alpha$, temperature $T$, and the tolerance parameter $m$,
from which the... | 1993-06-15 | 2007-05-23 | [
"cond-mat"
] | G. M. Shimi, D. Kim and M.Y. Choi (Department of Physics and Center
for Theoretical Physics Seoul National University, Seoul 151-742, Korea) |
cond-mat/9306030 | On the Internal Structure of the Singlet d$_{X^2-Y^2}$ Hole Pair in an
Antiferromagnet | Exact diagonalizations of two dimensional small t--J clusters reveal dominant
hole-hole correlations at distance $\sqrt{2}$ (ie between holes on next nearest
neighbor sites). A new form of singlet $d_{x^2-y^2}$ pair operator is proposed
to account for the spatial extention of the two hole-bound pair beyond nearest
neig... | 1993-06-10 | 2009-10-22 | [
"cond-mat"
] | Didier Poilblanc |
cond-mat/9306029 | Dyson's Brownian Motion and Universal Dynamics of Quantum Systems | We establish a correspondence between the evolution of the distribution of
eigenvalues of a $N\times N$ matrix subject to a random Gaussian perturbing
matrix, and a Fokker-Planck equation postulated by Dyson. Within this model, we
prove the equivalence conjectured by Altshuler et al between the space-time
correlations ... | 1993-06-10 | 2009-10-22 | [
"cond-mat"
] | Onuttom Narayan and B. Sriram Shastry |
cond-mat/9306031 | Nonlinear Hydrodynamics of a Hard Sphere Fluid Near the Glass Transition | We conduct a numerical study of the dynamic behavior of a dense hard sphere
fluid by deriving and integrating a set of Langevin equations. The statics of
the system is described by a free energy functional of the
Ramakrishnan-Yussouff form. We find that the system exhibits glassy behavior as
evidenced through stretched... | 1993-06-10 | 2009-10-22 | [
"cond-mat"
] | Lisa M. Lust and Oriol T. Valls (School of Physics and Astronomy,
Univ. of Minnesota) and Chandan Dasgupta (Dept. of Physics, Indian Institute
of Science) |
cond-mat/9306025 | Metal-Insulator Transitions in Degenerate Hubbard Models and
A$_x$C$_{60}$ | Mott-Hubbard metal-insulator transitions in $N$-fold degenerate Hubbard
models are studied within the Gutzwiller approximation. For any rational
filling with $x$ (integer) electrons per site it is found that metal-insulator
transition occurs at a critical correlation energy
$U_c(N,x)=U_c(N,2N-x)=\gamma(N,x)|\bar{\epsil... | 1993-06-09 | 2009-10-22 | [
"cond-mat"
] | Jian Ping Lu (Department of Physics and Astronomy, University of North
Carolina at Chapel Hill, Chapel Hill, North Carolina) |
cond-mat/9306024 | Tunneling into a two-dimensional electron system in a strong magnetic
field | We investigate the properties of the one-electron Green's function in an
interacting two-dimensional electron system in a strong magnetic field, which
describes an electron tunneling into such a system. From finite-size
diagonalization, we find that its spectral weight is suppressed near zero
energy, reaches a maximum ... | 1993-06-09 | 2007-05-23 | [
"cond-mat"
] | Song He, P.M.Platzman, and B.I.Halperin |
cond-mat/9306028 | The class of universality of integrable and isotropic GL(N) mixed
magnets | We discuss a class of transfer matrix built by a particular combination of
isomorphic and non-isomorphic GL(N) invariant vertex operators. We construct a
conformally invariant magnet constituted of an alternating mixture of GL(N)
``spins'' operators at different order of representation. The corresponding
central charge... | 1993-06-09 | 2016-08-31 | [
"cond-mat"
] | S.R. Aladim and M.J. Martins |
cond-mat/9306026 | Freezing of the quantum Hall liquid at $\nu = $ 1/7 and 1/9 | We compare the free energy computed from the ground state energy and
low-lying excitations of the 2-D Wigner solid and the fractional quantum Hall
liquid, at magnetic filling factors $\nu = 1/7$ and 1/9. We find that the
Wigner solid melts into the fractional quantum Hall liquid at roughly the same
temperature as that ... | 1993-06-09 | 2009-10-22 | [
"cond-mat"
] | Rodney Price, Xuejun Zhu, and P.M. Platzman (AT&T Bell Laboratories,
Murray Hill, NJ) |
cond-mat/9306023 | Implications of adiabatic phases for a vortex in a superconductor film | Based on ideas of off-diagonal long range order and two-fluid model, we
demonstrate that adiabatic phases for a slow motion of a vortex in a
superconductor film give rise naturally to the Magnus force at finite
temperatures. | 1993-06-09 | 2009-10-22 | [
"cond-mat"
] | Ping Ao, Qian Niu, and David J. Thouless |
cond-mat/9306027 | Critical Point Correlation Function for the 2D Random Coupling Ising
Model | High accuracy Monte Carlo simulation results for 1024*1024 Ising system with
ferromagnetic impurity bonds are presented. Spin-spin correlation function at a
critical point is found to be numerically very close to that of a pure system.
This is not trivial since a critical temperature for the system with impurities
is a... | 1993-06-09 | 2007-05-23 | [
"cond-mat"
] | Andrei Talapov and Vladimir Dotsenko |
cond-mat/9306021 | Rotational Invariance and the Theory of Directed Polymer Nematics | The consequences of rotational invariance in a recent theory of fluctuations
in dilute polymer nematics are explored. A correct rotationally invariant free
energy insures that anomalous couplings are not generated in a one-loop
renormalization group calculation. | 1993-06-08 | 2009-10-22 | [
"cond-mat"
] | Randall D. Kamien, Pierre Le Doussal and David R. Nelson |
cond-mat/9306015 | Kohn Anomalies in Superconductors | I present the detailed behavior of phonon dispersion curves near momenta
which span the electronic Fermi sea in a superconductor. I demonstrate that an
anomaly, similar to the metallic Kohn anomaly, exists in a superconductor's
dispersion curves when the frequency of the phonon spanning the Fermi sea
exceeds twice the ... | 1993-06-08 | 2009-10-22 | [
"cond-mat"
] | M.E. Flatte' |
cond-mat/9306020 | Tunneling into a two-dimensional electron system in a strong magnetic
field | We investigate the properties of the one-electron Green's function in an
interacting two-dimensional electron system in a strong magnetic field, which
describes an electron tunneling into such a system. From finite-size
diagonalization, we find that its spectral weight is suppressed near zero
energy, reaches a maximum ... | 1993-06-08 | 2009-10-22 | [
"cond-mat"
] | Song He, P. M. Platzman (AT\&T Bell Laboratories, Murray Hill, NJ), B.
I. Halperin (Department of Physics, Harvard University, Cambridge, MA) |
cond-mat/9306017 | Cellular automaton models and traffic flow | A recently introduced cellular automaton model for the description of traffic
flow is investigated. It generalises asymmetric exclusion models which have
attracted a lot of interest in the past. We calculate the so-called fundamental
diagram (flow vs.\ density) for parallel dynamics using an improved mean-field
approxi... | 1993-06-08 | 2009-10-22 | [
"cond-mat"
] | A. Schadschneider and M. Schreckenberg |
cond-mat/9306016 | Two-dimensional Superfluidity and Localization in the Hard-Core Boson
Model: a Quantum Monte Carlo Study | Quantum Monte Carlo simulations are used to investigate the two-dimensional
superfluid properties of the hard-core boson model, which show a strong
dependence on particle density and disorder. We obtain further evidence that a
half-filled clean system becomes superfluid via a finite temperature
Kosterlitz-Thouless tran... | 1993-06-08 | 2009-10-22 | [
"cond-mat"
] | T. Onogi and Y. Murayama |
cond-mat/9306022 | Slater Decomposition of Laughlin States | The second-quantized form of the Laughlin states for the fractional quantum
Hall effect is discussed by decomposing the Laughlin wavefunctions into the
$N$-particle Slater basis. A general formula is given for the expansion
coefficients in terms of the characters of the symmetric group, and the
expansion coefficients a... | 1993-06-08 | 2015-06-25 | [
"cond-mat",
"hep-th"
] | G. Dunne |
cond-mat/9306019 | Thermodynamics of the Anisotropic Spin-1/2 Heisenberg Chain and Related
Quantum Chains | The free energy and correlation lengths of the spin-1/2 $XYZ$ chain are
studied at finite temperature. We use the quantum transfer matrix approach and
derive non-linear integral equations for all eigenvalues. Analytic results are
presented for the low-temperature asymptotics, in particular for the critical
$XXZ$ chain ... | 1993-06-08 | 2009-10-22 | [
"cond-mat"
] | Andreas Kl\"umper |
cond-mat/9306018 | Excitation spectrum and critical exponents of a one-dimensional
integrable model of fermions with correlated hopping | We investigate the excitation spectrum of a model of $N$ colour fermions with
correlated hopping which can be solved by a nested Bethe ansatz. The gapless
excitations of particle-hole type are calculated as well as the spin-wave like
excitations which have a gap. Using general predictions of conformal field
theory the ... | 1993-06-08 | 2009-10-22 | [
"cond-mat"
] | R.Z. Bariev, A. Kl\"umper, A. Schadschneider, and J. Zittartz |
cond-mat/9306014 | Self-consistent calculation of ionized impurity scattering in
semiconductor quantum wires | We calculate the electron elastic mean free path due to ionized impurity
scattering in semiconductor quantum wires, using a scheme in which the screened
ionized impurity potential and the electron screening self-consistently
determine each other. By using a short-range scattering potential model, we
obtain an {\sl exac... | 1993-06-07 | 2007-05-23 | [
"cond-mat"
] | Ben Yu-Kuang Hu and S. Das Sarma |
cond-mat/9306012 | Low-Temperature Expansion for a First Order Surface Transition | The question concerning the possibility of a first order surface transition
in a semi--infinite Blume--Capel model is addressed by means of low temperature
expansions. It is found that such a transition can exist, according to mean
field and cluster variation approximations, and contrarily to renormalization
group resu... | 1993-06-04 | 2016-08-31 | [
"cond-mat"
] | C. Buzano and A. Pelizzola |
cond-mat/9306009 | Vibrations and Berry Phases of Charged Buckminsterfullerene | A simple model of electron-vibron interactions in buckminsterfullerene ions
is solved semiclassically. Electronic degeneracies of C$_{60}$$^{n-}$ induce
dynamical Jahn-Teller distortions, which are unimodal for $n\!\ne\!3$ and
bimodal for $n\!=\!3$. The quantization of motion along the Jahn-Teller
manifold leads to a s... | 1993-06-03 | 2009-10-22 | [
"cond-mat"
] | Assa Auerbach |
cond-mat/9306011 | Effect of Structure on the Electronic Density of States of Doped
Lanthanum Cuprate | We present a series of detailed band calculations on the various structural
phases of doped lanthanum cuprate: HTT, LTO, and LTT. The LTO distortion is
shown to have little effect on the electronic density of states (DOS). A fit to
the pressure dependence of the superconducting transition temperature indicates
that onl... | 1993-06-03 | 2009-10-22 | [
"cond-mat"
] | M.R. Norman, G.J. McMullan, D.L. Novikov, and A.J. Freeman |
cond-mat/9306010 | Phase Ordering in One-Dimensional Systems with Long-Range Interactions | We study the dynamics of phase ordering of a non-conserved, scalar order
parameter in one dimension, with long-range interactions characterized by a
power law $r^{-d-\sigma}$. In contrast to higher dimensional systems, the point
nature of the defects allows simpler analytic and numerical methods. We find
that, at least... | 1993-06-03 | 2009-10-22 | [
"cond-mat"
] | B. P. Lee and J. L. Cardy |
cond-mat/9306008 | Addition Spectra of Quantum Dots in Strong Magnetic Fields | We consider the magnetic field dependence of the chemical potential for
parabolically confined quantum dots in a strong magnetic field. Approximate
expressions based on the notion that the size of a dot is determined by a
competition between confinement and interaction energies are shown to be
consistent with exact dia... | 1993-06-03 | 2009-10-22 | [
"cond-mat"
] | S.-R. Eric Yang, A.H. MacDonald, and M.D. Johnson |
cond-mat/9306004 | The Superfluidity and Experimental Properties of Odd-Energy-Gap
Superconductors | We consider the experimental properties of superconductors with a gap which
is an odd function of energy $\bepsk=\epsk - \mu$, i.e.\ , a gap which vanishes
everywhere on the Fermi surface; this is done within a in a BCS framework.
Apart from the standard phenomenology (density of states, penetration depth,
NMR, $C_V(T)... | 1993-06-02 | 2009-10-22 | [
"cond-mat"
] | M. Dobroliubov, E. Langmann, P.C.E. Stamp |
cond-mat/9306006 | Compressible Phase of a Double-Layer Electron System with Total
Landau-Level Filling Factor One-Half | Following recent work of Halperin, Lee, and Read, and Kalmeyer and Zhang, a
double-layer electron system with total Landau-level filling factor $\nu=1/2$
is mapped onto an equivalent system of fermions in zero average magnetic field
interacting via a Chern-Simons gauge field. Within the random-phase
approximation a new... | 1993-06-02 | 2009-10-22 | [
"cond-mat"
] | N.E. Bonesteel |
cond-mat/9306005 | Escape Rates in Bistable Systems Induced by Quasi-Monochromatic Noise | Path integral techniques are used to understand the behaviour of a particle
moving in a bistable potential well and acted upon by quasi-monochromatic
external noise. In the limit of small diffusion coefficient, a steepest descent
evaluation of the path integral enables mean first passage times and the
transition times ... | 1993-06-02 | 2009-10-22 | [
"cond-mat"
] | S.J.B. Einchcomb and A.J. McKane |
cond-mat/9306007 | Toward a Unified Magnetic Phase Diagram of the Cuprate Superconductors | We propose a unified magnetic phase diagram of cuprate superconductors. A new
feature of this phase diagram is a broad intermediate doping region of
quantum-critical, $z=1$, behavior, characterized by temperature independent
$T_1T/T_{\rm 2G}$ and linear $T_1T$, where the spin waves are not completely
absorbed by the el... | 1993-06-02 | 2009-10-22 | [
"cond-mat"
] | A. Sokol and D. Pines |
cond-mat/9306002 | On Quantum Scattering of a System with Internal Degrees of Freedom | We study the quantum tunnelling of a very complex object of which only part
is coupled to an external potential ( the potential barrier ). We treat this
problem as the tunnelling of a particle (part of the system affected by the
potential) coupled to a ``heat bath" ( all of the remaining degrees of freedom
) from the p... | 1993-06-01 | 2008-02-03 | [
"cond-mat",
"hep-th",
"nucl-th"
] | A.H. Castro Neto and A.O. Caldeira |
cond-mat/9306003 | Integrable versus Non-Integrable Spin Chain Impurity Models | Recent renormalization group studies of impurities in spin-1/2 chains appear
to be inconsistent with Bethe ansatz results for a special integrable model. We
study this system in more detail around the integrable point in parameter space
and argue that this integrable impurity model corresponds to a non-generic
multi-cr... | 1993-06-01 | 2009-10-22 | [
"cond-mat"
] | E. S. Sorensen, S. Eggert and I. Affleck |
cond-mat/9306001 | Haldane gap in the quasi one-dimensional nonlinear $\sigma$-model | This work studies the appearance of a Haldane gap in quasi one-dimensional
antiferromagnets in the long wavelength limit, via the nonlinear
$\sigma$-model. The mapping from the three-dimensional, integer spin Heisenberg
model to the nonlinear $\sigma$-model is explained, taking into account two
antiferromagnetic coupli... | 1993-06-01 | 2009-10-22 | [
"cond-mat"
] | D. Senechal |
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