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/9405090 | On the Non-invasive Measurement of the Intrinsic Quantum Hall Effect | With a model calculation, we demonstrate that a non-invasive measurement of
intrinsic quantum Hall effect defined by the local chemical potential in a
ballistic quantum wire can be achieved with the aid of a pair of voltage leads
which are separated by potential barriers from the wire. B\"uttiker's formula
is used to d... | 1994-05-31 | 2009-10-22 | [
"cond-mat"
] | D. P. Chu and P. N. Butcher |
cond-mat/9405089 | Simulation of forces on polymers due to slippage | We consider the force on the end of a polymer chain being pulled through a
network at velocity $v$, using computer simulations. We develop algorithms for
measuring the force on the end of the chain using lattice models of polymers.
Our algorithm attaches a spring to the end being pulled and uses its average
extension t... | 1994-05-31 | 2009-10-22 | [
"cond-mat"
] | J.M. Deutsch and Hyoungsoo Yoon |
cond-mat/9405088 | Depinning in a Random Medium | We develop a renormalized continuum field theory for a directed polymer
interacting with a random medium and a single extended defect. The
renormalization group is based on the operator algebra of the pinning
potential; it has novel features due to the breakdown of hyperscaling in a
random system. There is a second-ord... | 1994-05-30 | 2009-10-22 | [
"cond-mat"
] | H. Kinzelbach and M. Lassig |
cond-mat/9405087 | Raman Scattering Spectra of Elementary Electronic Excitations in Coupled
Double-Quantum Well Structures | Using the time-dependent-local-density-approximation (TDLDA) within a
self-consistent linear response theory, we calculate the elementary excitation
energies and the associated inelastic light-scattering spectra of a strongly
coupled two-component plasma in a double-quantum well system with electron
occupation of symme... | 1994-05-29 | 2009-10-22 | [
"cond-mat"
] | P. I. Tamborenea and S. Das Sarma |
cond-mat/9405084 | Exactly solvable random matrix models with additional two-body
interactions | It has been argued that despite remarkable success, existing random matrix
theories are not adequate to describe disordered conductors in the metallic
regime, due to the presence of certain two-body interactions in the effective
Hamiltonian for the eigenvalues, in addition to the standard logarithmic
interaction that a... | 1994-05-27 | 2007-05-23 | [
"cond-mat"
] | K.A.Muttalib |
cond-mat/9405086 | Localized electronic states and photoemission superconducting condensate
in Bi$_{2}$Sr$_{2}$Ca$_{1}$Cu$_{2}$O$_{8+x}$ | We present the first detailed angle-resolved photoemission evidence that
there are two types of carriers that contribute to the photoemission
superconducting condensate in $Bi_{2}Sr_{2}Ca_{1}Cu_{2}O_{8+x}$. Our data
indicate that both itinerant and somewhat localized normal state carriers can
contribute to the formatio... | 1994-05-27 | 2009-10-22 | [
"cond-mat"
] | Jian Ma, C.Quitmann, R.J.Kelley, G. Margaritondo, and M.Onellion (Dept
of Phys. & Applied Superconductivity Center, UW-Madison, and EPFL, Lausanne,
Switzerland.) |
cond-mat/9405085 | Thermodynamics and spin gap of the Heisenberg ladder calculated by the
look-ahead Lanczos algorithm | We have developed an improved version of the quantum transfer matrix
algorithm. The extreme eigenvalues and eigenvectors of the transfer matrix are
calculated by the recently developed look-ahead Lanczos algorithm for
non-Hermitian matrices with higher efficiency and accuracy than by the power
method. We have applied t... | 1994-05-27 | 2007-05-23 | [
"cond-mat"
] | Matthias Troyer, Hirokazu Tsunetsugu and Diethelm Wuertz |
cond-mat/9405083 | Gauge-invariant response functions of fermions coupled to a gauge field | We study a model of fermions interacting with a gauge field and calculate
gauge-invariant two-particle Green's functions or response functions. The
leading singular contributions from the self-energy correction are found to be
cancelled by those from the vertex correction for small $q$ and $\Omega$. As a
result, the re... | 1994-05-26 | 2009-10-22 | [
"cond-mat"
] | Yong Baek Kim, Akira Furusaki, Xiao-Gang Wen, and Patrick A. Lee |
cond-mat/9405075 | Self Induced Quenched Disorder: A Model for the Glass Transition | We consider a simple spin system without disorder which exhibits a glassy
regime. We show that this model can be well approximated by a system with
quenched disorder which is studied with the standard methods developped in spin
glasses. We propose that the glass transition is a point where quenched
disorder is self ind... | 1994-05-26 | 2009-10-22 | [
"cond-mat"
] | J.P. Bouchaud and M. Mezard |
cond-mat/9405079 | Metastable Dynamics above the Glass Transition | The element of metastability is incorporated in the fluctuating nonlinear
hydrodynamic description of the mode coupling theory (MCT) of the liquid-glass
transition. This is achieved through the introduction of the defect density
variable $n$ into the set of slow variables with the mass density $\rho$ and
the momentum d... | 1994-05-26 | 2009-10-22 | [
"cond-mat"
] | Joonhyun Yeo and Gene F. Mazenko |
cond-mat/9405074 | Suppression of Persistent Currents in 1-D Disordered Rings by Coulomb
Interaction | Effects of Coulomb interaction on persistent currents in disordered
one-dimensional rings are numerically investigated. First of all effectiveness
of the Hartree-Fock approximation is established on small systems. Then the
calculations are done for systems with 40 electrons in 100 sites. It is found
that the amplitude ... | 1994-05-26 | 2009-10-22 | [
"cond-mat"
] | H. Kato and D. Yoshioka |
cond-mat/9405076 | Electrons in a Strong Magnetic Field on a Disk | The problem of interacting electrons moving under the influence of a strong
magnetic field in two dimensions on a finite disk is reconsidered. First, the
results of exact diagonalizations for up to $N=9$ electrons for Coulomb as well
as for a short--range interaction are used in the search for a peculiar ground
state c... | 1994-05-26 | 2009-10-22 | [
"cond-mat"
] | M. Kasner and W. Apel |
cond-mat/9405080 | On the Inequivalence of Weak-Localization and Coherent Backscattering | We define a current-conserving approximation for the local conductivity
tensor of a disordered system which includes the effects of weak localization.
Using this approximation we show that the weak localization effect in
conductance is not obtained simply from the diagram corresponding to the
coherent back-scattering p... | 1994-05-26 | 2009-10-22 | [
"cond-mat"
] | Matthew B. Hastings, A. Douglas Stone, and Harold U. Baranger |
cond-mat/9405078 | Spin gap and superconductivity in the three-dimensional attractive
Hubbard model | We study the phase diagram for the attractive ({\it i.e.,} negative-$U$)
Hubbard model on a simple cubic lattice, through Monte Carlo simulations. We
obtain the critical temperature, $T_c$, for superconductivity from a
finite-size scaling analysis of the data for the pairing correlations. For
fixed on-site attraction, ... | 1994-05-26 | 2007-05-23 | [
"cond-mat"
] | Raimundo R dos Santos |
cond-mat/9405081 | Quantum Field Theory Description of Tunneling in the Integer Quantum
Hall Effect | We study the tunneling between two quantum Hall systems, along a quasi
one-dimensional interface. A detailed analysis relates microscopic parameters,
characterizing the potential barrier, with the effective field theory model for
the tunneling. It is shown that the phenomenon of fermion number
fractionalization is expe... | 1994-05-26 | 2009-10-22 | [
"cond-mat",
"hep-th"
] | D. G. Barci and L. Moriconi |
cond-mat/9405082 | Possible Metal/Insulator Transition at B=0 in Two Dimensions | We have studied the zero magnetic field resistivity of unique high- mobility
two-dimensional electron system in silicon. At very low electron density (but
higher than some sample-dependent critical value, $n_{cr}\sim 10^{11}$
cm$^{-2}$), CONVENTIONAL WEAK LOCALIZATION IS OVERPOWERED BY A SHARP DROP OF
RESISTIVITY BY AN... | 1994-05-26 | 2009-10-22 | [
"cond-mat"
] | S. V. Kravchenko, G. V. Kravchenko, J. E. Furneaux, V. M. Pudalov, and
M. D'Iorio |
cond-mat/9405077 | Weak-Localization in Chaotic Versus Non-Chaotic Cavities: A Striking
Difference in the Line Shape | We report experimental evidence that chaotic and non-chaotic scattering
through ballistic cavities display distinct signatures in quantum transport. In
the case of non-chaotic cavities, we observe a linear decrease in the average
resistance with magnetic field which contrasts markedly with a Lorentzian
behavior for a c... | 1994-05-26 | 2009-10-22 | [
"cond-mat"
] | A. M. Chang, H. U. Baranger, L. N. Pfeiffer, and K. W. West |
cond-mat/9405071 | Evidence for a Pseudogap Above the Critical Temperature in the
Attractive Hubbard Model | We explore the effect of fluctuations for $T \geq T_c$ in the 2-D negative
Hubbard model within the framework of the selfconsistent T-matrix formalism,
which goes beyond the BCS approximation and includes pair fluctuations. We
enter the regime where correlations are important, namely, $U/t = -4.0$, where
$t$ denotes th... | 1994-05-25 | 2016-08-14 | [
"cond-mat"
] | J.J. Rodr\'iguez-N\'u\~nez, S. Schafroth, R. Micnas, T. Schneider, H.
Beck and M.H. Pedersen |
cond-mat/9405070 | Competition of Phonons and Magnetic Interaction in One-Dimensional
Fermion Systems | We consider a system of spin-dependent fermions on a one-dimensional lattice
which is coupled to phonons. The phonons create either a Peierls instability by
breaking the translational invariance or create long range correlations. On the
other hand, there is a spin-dependent Hubbard-like interaction which competes
with ... | 1994-05-25 | 2019-08-17 | [
"cond-mat"
] | D.Braak, F.Sievers and K.Ziegler |
cond-mat/9405073 | Partially Asymmetric Exclusion Process with Open Boundaries | Exclusive diffusion on a one-dimensional lattice is studied. In the model
particles hop stochastically into both directions with different rates. At the
ends of the lattice particles are injected and removed. The exact stationary
probability measure is represented in form of a matrix product as a
generalization of the ... | 1994-05-25 | 2009-10-22 | [
"cond-mat"
] | Sven Sandow |
cond-mat/9405072 | Nonlinear Susceptibility: A Direct Test of the Quadrupolar Kondo Effect
in UBe(13) | We present the nonlinear susceptibility as a direct test of the quadrupolar
Kondo scenario for heavy fermion behavior, and apply it to the case of cubic
crystal-field symmetry. Within a single-ion model we compute the nonlinear
susceptibility resulting from low-lying \Gamma_3 (5f^2 and Kramers (5f^3)
doublets. We find ... | 1994-05-25 | 2009-10-22 | [
"cond-mat"
] | A.P. Ramirez (ATT), P. Chandra (NECI), P. Coleman (RUTGERS), Z.Fisk
(LANL), J.L. Smith (LANL) and H.R. Ott (ETH) |
cond-mat/9405065 | Dynamic Magneto-Conductance Fluctuations and Oscillations in Mesoscopic
Wires and Rings | Using a finite-frequency recursive Green's function technique, we calculate
the dynamic magneto-conductance fluctuations and oscillations in disordered
mesoscopic normal metal systems, incorporating inter-particle Coulomb
interactions within a self-consistent potential method. In a disordered metal
wire, we observe erg... | 1994-05-24 | 2007-05-23 | [
"cond-mat"
] | D.Z. Liu, Ben Yu-Kuang Hu, C. A. Stafford, and S. Das Sarma |
cond-mat/9405069 | Direct Calculation of Spin-Stiffness for Spin-1/2 Heisenberg Models | The spin-stiffness of frustrated spin-1/2 Heisenberg models in one and two
dimensions is computed for the first time by exact diagonalizations on small
clusters that implement spin-dependent twisted boundary conditions. Finite-size
extrapolation to the thermodynamic limit yields a value of $0.14\pm 0.01$ for
the spin-s... | 1994-05-24 | 2009-10-22 | [
"cond-mat"
] | J. Bonca, J.P. Rodriguez, J. Ferrer and K.S. Bedell |
cond-mat/9405066 | Statistics of the One-Electron Current in a One-Dimensional Mesoscopic
Ring at Arbitrary Magnetic Fields | The set of moments and the distribution function of the one-electron current
in a one-dimensional disordered ring with arbitrary magnetic flux are
calculated. | 1994-05-24 | 2009-10-22 | [
"cond-mat",
"hep-th"
] | A.S. Cattaneo, A. Gamba and I.V. Kolokolov |
cond-mat/9405067 | Vortices on "rail road tracks": A possible realization of random matrix
ensemble | The thermodynamics of interacting vortices constricted to move in
one-dimensional tracks carved out on superconducting film in the extreme
type-II limit is mapped onto the Coulomd gas model of random matrices. | 1994-05-24 | 2009-10-22 | [
"cond-mat"
] | Y Chen and H J Jensen |
cond-mat/9405068 | Distribution function for shotnoise in disordered multi-channel quantum
conductors | We obtain the shot noise generating function for a multi-channel quantum
conductor in the diffusive limit. | 1994-05-24 | 2007-05-23 | [
"cond-mat"
] | K A Muttalib and Y Chen |
cond-mat/9405061 | Non-equilibrium noise in a mesoscopic conductor: microscopic analysis | Current fluctuations are studied in a mesoscopic conductor using
non-equilibrium Keldysh technique. We derive a general expression for the
fluctuations in the presence of a time dependent voltage, valid for arbitrary
relation between voltage and temperature. Two limits are then treated: a pulse
of voltage and a DC volt... | 1994-05-23 | 2007-05-23 | [
"cond-mat"
] | B. L. Altshuler, L. S. Levitov, and A. Yu. Yakovets |
cond-mat/9405062 | Saddle Points and Stark Ladders: Exact Calculations of Exciton Spectra
in Superlattices | A new, exact method for calculating excitonic absorption in superlattices is
described. It is used to obtain high resolution spectra showing the saddle
point exciton feature near the top of the miniband. The evolution of this
feature is followed through a series of structures with increasing miniband
width. The Stark l... | 1994-05-23 | 2009-10-22 | [
"cond-mat"
] | D. M. Whittaker (Department of Physics, University of Sheffield,
Sheffield. UK) |
cond-mat/9405064 | The mechanism of spin and charge separation in one dimensional quantum
antiferromagnets | We reconsider the problem of separation of spin and charge in one dimensional
quantum antiferromagnets. We show that spin and charge separation in one
dimensional strongly correlated systems cannot be described by the slave boson
or fermion representation within any perturbative treatment of the interactions
between th... | 1994-05-23 | 2009-10-22 | [
"cond-mat",
"hep-th"
] | C. Mudry and E. Fradkin |
cond-mat/9405063 | Exact Dynamical Correlation Functions of Calogero-Sutherland Model and
One-Dimensional Fractional Statistics | One-dimensional model of non-relativistic particles with inverse-square
interaction potential known as Calogero-Sutherland Model (CSM) is shown to
possess fractional statistics. Using the theory of Jack symmetric polynomial
the exact dynamical density-density correlation function and the one-particle
Green's function (... | 1994-05-23 | 2009-10-22 | [
"cond-mat",
"hep-th"
] | Z. N. C. Ha |
cond-mat/9405060 | On the theory of diamagnetism in granular superconductors | We study a highly disordered network of superconducting granules linked by
weak Josephson junctions in magnetic field and develop a mean field theory for
this problem. The diamagnetic response to a slow {\it variations} of magnetic
field is found to be analogous to the response of a type-II superconductor with
extremel... | 1994-05-21 | 2009-10-22 | [
"cond-mat"
] | M. V. Feigelman and L. B. Ioffe |
cond-mat/9405059 | Nonlinear Conductance for the Two Channel Anderson Model | Using the integral equations of the Noncrossing Approximation, the
differential conductance is computed as a function of voltage for scattering
from a two channel Kondo impurity in a point contact. The results compare well
to experimental data on Cu point contacts by Ralph and Buhrman. They support a
recently proposed ... | 1994-05-21 | 2009-10-22 | [
"cond-mat"
] | Matthias H. Hettler, Johann Kroha, and Selman Hershfield |
cond-mat/9405057 | The Fermi Edge Singularity and Boundary Condition Changing Operators | The boundary conformal field theory approach to quantum impurity problems is
used to study the Fermi edge singularity, occuring in the X-ray adsorption
probablility. The deep-hole creation operator, in the effective low-energy
theory, changes the boundary condition on the conduction electrons. By a
conformal mapping, t... | 1994-05-20 | 2009-10-22 | [
"cond-mat",
"hep-th"
] | Ian Affleck and Andreas W.W. Ludwig |
cond-mat/9405052 | Statistics of Oscillator Strengths in Chaotic Systems | The statistical description of oscillator strengths for systems like hydrogen
in a magnetic field is developed by using the supermatrix nonlinear
$\sigma$-model. The correlator of oscillator strengths is found to have a
universal parametric and frequency dependence, and its analytical expression is
given. This universa... | 1994-05-20 | 2009-10-22 | [
"cond-mat"
] | Nobuhiko Taniguchi, A. V. Andreev and Boris L. Altshuler |
cond-mat/9405053 | Slave Boson Formulation for Interacting Boson Systems and the
Superfluid-Insulator Transition | A new formulation for the study of interacting bosons on a lattice is
introduced. This approach is used to give analytical expressions for the Mott
insulating lobes in the phase diagram and to calculate the density-density
correlation function. It is also shown that, at mean-field level, this newly
introduced slave bos... | 1994-05-20 | 2007-05-23 | [
"cond-mat"
] | Raymond Fresard (Institut fuer Theorie der Kondensierten Materie, U.
Karlsruhe) |
cond-mat/9405055 | Conductance and conductance fluctuations of narrow disordered quantum
wires | In this paper we present and discuss our results for the conductance and
conductance fluctuations of narrow quantum wires with two types of disorder:
boundary roughness (hard wall confining potential) and islands of strongly
scattering impurities within the bulk of the wire. We use a tight--binding
Hamiltonian to descr... | 1994-05-20 | 2009-10-22 | [
"cond-mat"
] | K Nikoli\'c and A MacKinnon (Imperial College London) |
cond-mat/9405058 | A Superconducting Instability in the Infinite-U Anderson Lattice in the
Presence of Crystal Electric Fields | We report evidence of a superconducting instability (of $T_{1g}$ symmetry) in
the infinite-U Anderson lattice in the presence of crystal fields of cubic
symmetry. We assume a lattice of $4f$ sites, each with a total angular momentum
of $J=5/2$ that is split by crystal fields into a low-lying doublet of
$\Gamma_7$ symme... | 1994-05-20 | 2009-10-22 | [
"cond-mat"
] | B. R. Trees |
cond-mat/9405054 | Solution of the two impurity, two channel Kondo Model | We solve the two-impurity two-channel Kondo model using a combination of
conformal invariance and bosonisation techniques. The odd-even symmetric case
is analysed in detail. The RKKY interaction turns out to be exactly marginal,
resulting in a line of non-Fermi liquid fixed points. Explicit formulae are
given for the c... | 1994-05-20 | 2009-10-22 | [
"cond-mat",
"chao-dyn",
"nlin.CD"
] | A.Georges and A.Sengupta |
cond-mat/9405056 | On the Thermodynamics of Laughlin Liquid Freezing | The competition between liquid and solid states of strongly correlated
electron systems occurs in a novel way in a strong magnetic field. The fact
that certain Landau level filling factors are especially favorable for the
formation of strongly correlated liquid states, gives rise to the fractional
quantum Hall effect. ... | 1994-05-20 | 2007-05-23 | [
"cond-mat"
] | Anthony Chan and A.H. MacDonald (Department of Physics, Indiana
University, Bloomington IN) |
cond-mat/9405051 | AC Response of Flux-Line Liquid in High $T_c$ Superconductors | We use a hydrodynamics theory to discuss the response of a viscous flux-line
liquid to an ac perturbation applied at the surface of the sample. The theory
incorporates viscoelastic effects and describes the crossover between
liquid-like and solid-like response of the vortex array as the frequency of the
perturbation in... | 1994-05-19 | 2009-10-22 | [
"cond-mat"
] | Lee-Wen Chen, M. Cristina Marchetti (Dept. of Physics, Syracuse U.) |
cond-mat/9405050 | Observation of a van Hove Singularity in
$Bi_{2}Sr_{2}Ca_{1}Cu_{2}O_{8+x}$ with Angle Resolved Photoemission | We have performed high energy resolution angle-resolved photoemission studies
of the normal state band structure of oxygen overdoped
$Bi_{2}Sr_{2}Ca_{1}Cu_{2}O_{8+x}$. We find that there is an extended saddle
point singularity in the density of states along $\Gamma-\bar{M}-Z$ direction.
The data also indicate that ther... | 1994-05-18 | 2016-08-14 | [
"cond-mat"
] | Jian Ma, C.Quitmann, R.J.Kelley, P.Alm\'eras, H.Berger, G.
Margaritondo, and M.Onellion (Dept.of Phys. & ASC, UW-Madison and EPFL
Switzerland) |
cond-mat/9405049 | Resistivity of the Two-Channel Kondo Model in Infinite Dimensions | Analytic results for the resistivity of the two-channel Kondo lattice in a
particular infinite dimensional limit (Lorentzian density of states) are
presented. It is argued that in the absence of symmetry breaking phase
transitions or applied fields there is a residual resistivity at zero
temperature due to the spin dis... | 1994-05-17 | 2008-02-03 | [
"cond-mat"
] | D.L. Cox (Ohio State) |
cond-mat/9405046 | Interacting Electrons on a Square Fermi Surface | Electronic states near a square Fermi surface are mapped onto quantum chains.
Using boson-fermion duality on the chains, the bosonic part of the interaction
is isolated and diagonalized. These interactions destroy Fermi liquid behavior.
Non-boson interactions are also generated by this mapping, and give rise to a
new p... | 1994-05-17 | 2009-10-22 | [
"cond-mat"
] | A. Luther |
cond-mat/9405047 | Critical Behaviour of the Randomly Spin--Diluted 2-d Ising Model --- A
Grand Ensemble Approach | The critical behaviour of the randomly spin-diluted Ising model in two space
dimensions is investigated by a new method which combines a grand ensemble
approach to disordered systems proposed by Morita with the phenomenological
renormalization group scheme of Nightingale. Accurate approximations for the
phase diagram a... | 1994-05-17 | 2009-10-22 | [
"cond-mat",
"hep-lat"
] | R. K\"uhn |
cond-mat/9405048 | Kinetic Inductance of Josephson Junction Arrays: Dynamic and Equilibrium
Calculations | We show analytically that the inverse kinetic inductance $L^{-1}$ of an
overdamped junction array at low frequencies is proportional to the admittance
of an inhomogeneous equivalent impedance network. The $ij^{th}$ bond in this
equivalent network has an inverse inductance
$J_{ij}\cos(\theta_i^0-\theta_j^0-A_{ij})$, whe... | 1994-05-17 | 2009-10-22 | [
"cond-mat"
] | Wenbin Yu and D. Stroud |
cond-mat/9405044 | Optical absorption spectra of A6C60 and A6C70: Reduction of effective
Coulomb interactions in Frenkel excitons | We theoretically investigate optical absorption spectra of $\soc^{6-}$ and
$\rug^{6-}$, and discuss relations with the optical properties of alkali metal
doped fullerides $A_6\soc$ and $A_6\rug$. This is a valid approach for systems
where Frenkel exciton effects are dominant. We use a tight binding model with
long rang... | 1994-05-16 | 2007-05-23 | [
"cond-mat",
"chem-ph"
] | Kikuo Harigaya (Fundamental Physics Section, Electrotechnical
Laboratory, Japan) |
cond-mat/9405045 | Spin Gaps in Coupled t-J Ladders | Spin gaps in coupled $t$-$J$ ladders are investigated by exact
diagonalization of small clusters up to 4$\times$8 sites. At half-filling, the
numerical results for the triplet excitation spectrum are in very good
agreement with a second order perturbation expansion in term of small
inter-ladder and intra-ladder exchang... | 1994-05-16 | 2009-10-22 | [
"cond-mat"
] | D. Poilblanc, H. Tsunetsugu, and T.M. Rice |
cond-mat/9405043 | Dynamical T=0 correlations of the S=1/2 1D Heisenberg Anti-Ferromagnet
with 1/r^2 exchange in a magnetic field | We present a new selection rule for matrix elements of local spin operators
in the $S=1/2$ ``Haldane-Shastry'' model. Based on this rule we extend a recent
exact calculation \cite{H93} of the ground-state dynamical spin correlation
function $S^{ab}(n,t)$ = $\langle 0 | S^a(n,t)S^b(0,0)| 0 \rangle$ and its
Fourier-trans... | 1994-05-14 | 2009-10-22 | [
"cond-mat"
] | J.C. Talstra and F.D.M. Haldane |
cond-mat/9405042 | Non-equilibrium dynamics in the random bond Ising chain: A reminiscence
of aging in spin glasses | Results of extensive Monte-Carlo simulations that investigate the
out-of-equilibrium dynamics of the one-dimensional Ising spin glass model with
a Gaussian bond-distribution are presented. At low enough temperatures a
typical (interrupted) aging scenario is established as in two- and similar to
three-dimensional spin g... | 1994-05-14 | 2007-05-23 | [
"cond-mat",
"hep-lat"
] | H.Rieger J. Kisker and M.Schreckenberg |
cond-mat/9405041 | Intensity Distribution of Waves Transmitted Through a Multiple
Scattering Medium | The distributions of the angular transmission coefficient and of the total
transmission are calculated for multiple scattered waves. The calculation is
based on a mapping to the distribution of eigenvalues of the transmission
matrix. The distributions depend on the profile of the incoming beam. The
distribution functio... | 1994-05-13 | 2009-10-22 | [
"cond-mat"
] | Th. M. Nieuwenhuizen and M. C. W. van Rossum |
cond-mat/9405038 | New Family of Solvable 1D Heisenberg Models | Starting from a Calogero--Sutherland model with hyperbolic interaction
confined by an external field with Morse potential we construct a Heisenberg
spin chain with exchange interaction $\propto 1/\sinh^2 x$ on a lattice given
in terms of the zeroes of Laguerre polynomials. Varying the strength of the
Morse potential th... | 1994-05-13 | 2017-01-18 | [
"cond-mat"
] | Holger Frahm and Vladimir I. Inozemtsev |
cond-mat/9405037 | Re-Structuring Method for the Negative Sign Problem in Quantum Spin
Systems | We present detailed discussions on a new approach we proposed in a previous
paper to numerically study quantum spin systems. This method, which we will
call re-structuring method hereafter, is based on rearrangement of intermediate
states in the path integral formulation. We observed our approach brings
remarkable impr... | 1994-05-13 | 2017-02-01 | [
"cond-mat"
] | Tomo Munehisa and Yasuko Munehisa |
cond-mat/9405040 | Flame propagation in random media | We introduce a phase-field model to describe the dynamics of a
self-sustaining propagating combustion front within a medium of randomly
distributed reactants. Numerical simulations of this model show that a flame
front exists for reactant concentration $c > c^* > 0$, while its vanishing at
$c^*$ is consistent with mean... | 1994-05-13 | 2009-10-22 | [
"cond-mat"
] | N. Provatas, T. Ala-Nissila, Martin Grant, K. R. Elder, Luc Pich |
cond-mat/9405036 | Double-tip STM for Surface Analysis | We explore the possibility of using a double-tip STM to probe the single
electron Green function of a sample surface, and describe a few important
applications: (1) Probing constant energy surfaces in $\k$-space by ballistic
transport; (2) Measuring scattering phase shifts of defects; (3) Observing the
transition from ... | 1994-05-13 | 2008-02-03 | [
"cond-mat"
] | Q.Niu, M.C.Chang, and C.K.Shih |
cond-mat/9405039 | Superconductivity in the Two-Dimensional $t$-$J$ Model at Low Hole
Doping | By combining a generalized Lanczos scheme with the variational Monte Carlo
method we can optimize the short- and long-range properties of the groundstate
separately. This allows us to measure the long-range order of the groundstate
of the $t$-$J$ model as a function of the coupling constant $J/t$, and identify
a region... | 1994-05-13 | 2016-08-31 | [
"cond-mat"
] | Elmar S. Heeb and T. Maurice Rice |
cond-mat/9405034 | Flow equations for the Anderson Hamiltonian | Using a continuous unitary transformation recently proposed by Wegner
\cite{Wegner} together with an approximation that neglects irrelevant
contributions, we obtain flow equations for Hamiltonians. These flow equations
yield a diagonal or almost diagonal Hamiltonian. As an example we investigate
the Anderson Hamiltonia... | 1994-05-12 | 2009-10-22 | [
"cond-mat"
] | Stephan Kehrein and Andreas Mielke |
cond-mat/9405035 | $\eta$-pairing as a mechanism of superconductivity in models of strongly
correlated electrons | We consider extended versions of the Hubbard model which contain additional
interactions between nearest neighbours. In this letter we show that a large
class of these models has a superconducting ground state in arbitrary
dimensions. In some special cases we are able to find the complete phase
diagram. The superconduc... | 1994-05-12 | 2009-10-22 | [
"cond-mat",
"hep-th"
] | Jan de Boer, Vladimir E. Korepin and Andreas Schadschneider |
cond-mat/9405032 | Excitonic Instability and Origin of the Mid-Gap States | In the framework of the two-band model of a doped semiconductor the
self-consistent equations describing the transition into the excitonic
insulator state are obtained for the 2D case. It is found that due to the
exciton-electron interactions the excitonic phase may arise with doping in a
semiconductor stable initially... | 1994-05-11 | 2009-10-22 | [
"cond-mat"
] | Michael N. Kiselev |
cond-mat/9405033 | Infrared Spectroscopic Study of Phase Transisions in A1c60 Compounds
(a=K,Rb,Cs) | Optical measurements on doped C$_{60}$ films provide evidence for a
transition from a high temperature conducting phase to a low temperature
insulating phase in quenched Rb$_1$C$_{60}$ and K$_1$C$_{60}$ compounds, while
Cs$_1$C$_{60}$ did not exhibit this behavior. For slow cooled samples our study
confirms earlier res... | 1994-05-11 | 2007-05-23 | [
"cond-mat"
] | Daniel Koller, Michael C. Martin and Laszlo Mihaly |
cond-mat/9405031 | Reaction-Diffusion Processes Described by Three-State Quantum Chains and
Integrability | The master equation of one-dimensional three-species reaction-diffusion
processes is mapped onto an imaginary-time Schr\"odinger equation. In many
cases the Hamiltonian obtained is that of an integrable quantum chain. Within
this approach we search for all $3$-state integrable quantum chains whose
spectra are known and... | 1994-05-11 | 2009-10-22 | [
"cond-mat"
] | Silvio R. Dahmen (University of Bonn) |
cond-mat/9405027 | Kosterlitz-Thouless Transition in
Bi${}_2$Sr${}_2$CaCu${}_2$O${}_8+\delta$ Thin Films | Current-voltage ($I-V$) characteristics and the increase of superconducting
transition temperature $T_c$ as a function of the number of half-unit-cell
layers $n$ are studied on Bi${}_2$Sr${}_2$CaCu${}_2$O${}_{8+\delta}$ thin films
grown by molecular beam epitaxy. These observations are interpreted in terms of
Kosterlit... | 1994-05-10 | 2008-02-03 | [
"cond-mat"
] | Vortex String, Tomoko Ota, Ichiro Tsukada, Ichiro Terasaki, and
Kunimitsu Uchinokura |
cond-mat/9405026 | Current-voltage characteristics of a tunnel junction with resonant
centers | We calculate the I-V characteristics of a tunnel junction containing
impurities in the barrier. We consider the indirect resonant tunneling
involving the impurities. The Coulomb repulsion energy $E_c$ between two
electrons with opposite spins simultaneously residing on the impurity is
introduced by an Anderson Hamilton... | 1994-05-10 | 2009-10-22 | [
"cond-mat"
] | T. Ivanov, and V. Valtchinov |
cond-mat/9405029 | Propagation and Extinction in Branching Annihilating Random Walks | We investigate the temporal evolution and spatial propagation of branching
annihilating random walks in one dimension. Depending on the branching and
annihilation rates, a few-particle initial state can evolve to a propagating
finite density wave, or extinction may occur, in which the number of particles
vanishes in th... | 1994-05-10 | 2009-10-22 | [
"cond-mat"
] | Daniel ben-Avraham, Francois Leyvraz, and Sid Redner |
cond-mat/9405030 | Can Impurity Effects Help to Identify the Symmetry of the Order
Parameter of the Cuprates? | The effects of non-magnetic impurities on the properties of superconductors
with order parameters (OP) of different symmetry are discussed. In particular,
we contrast the case of a d_{x^2 - y^2} with various forms of an anisotropic
s-wave (ASW) gap. The biggest qualitative difference occurs if the phase of the
s-wave O... | 1994-05-10 | 2009-10-22 | [
"cond-mat"
] | R. Fehrenbacher and M.R. Norman |
cond-mat/9405025 | Iterated perturbation theory for the attractive Holstein and Hubbard
models | A strictly truncated (weak-coupling) perturbation theory is applied to the
attractive Holstein and Hubbard models in infinite dimensions. These results
are qualified by comparison with essentially exact Monte Carlo results. The
second order iterated perturbation theory is shown to be quite accurate in
calculating trans... | 1994-05-10 | 2009-10-22 | [
"cond-mat"
] | J. K. Freericks and Mark Jarrell |
cond-mat/9405028 | Explicit Solutions of the Bethe Ansatz Equations for Bloch Electrons in
a Magnetic Field | For Bloch electrons in a magnetic field, explicit solutions are obtained at
the center of the spectrum for the Bethe ansatz equations recently proposed by
Wiegmann and Zabrodin. When the magnetic flux per plaquette is $1/Q$ where $Q$
is an odd integer, distribution of the roots is uniform on the unit circle in
the comp... | 1994-05-10 | 2009-10-22 | [
"cond-mat",
"hep-th"
] | Yasuhiro Hatsugai, Mahito Kohmoto, and Yong-Shi Wu |
cond-mat/9405022 | Magnetization of Disordered Ballistic Quantum Billards | We study the magnetic response of mesoscopic quantum dots in the ballistic
regime where the mean free path $l_e$ is larger that the size $L$ of the
sample, yet smaller than $L (k_F L)^{d-1}$. In this regime, disorder plays an
important role. Employing a semiclassical picture we calculate the contribution
of long trajec... | 1994-05-09 | 2009-10-22 | [
"cond-mat"
] | Daniel Braun, Yuval Gefen and Gilles Montambaux |
cond-mat/9405024 | One-Dimensional Kondo Lattice at Half Filling: Charge Properties | The model of Kondo chain with $M$-fold degenerate band of conduction
electrons of spin 1/2 at half filling interacting with localized spins $S$ is
studied. It is shown that due to the instanton effects the spin sector reveals
itself in optical conductivity. Namely, the density of the charge current at
large wave vector... | 1994-05-09 | 2007-05-23 | [
"cond-mat"
] | A. M. Tsvelik (University of Oxford) |
cond-mat/9405018 | Construction of transferable spherically-averaged electron potentials | A new scheme for constructing approximate effective electron potentials
within density-functional theory is proposed. The scheme consists of
calculating the effective potential for a series of reference systems, and then
using these potentials to construct the potential of a general system. To make
contact to the refer... | 1994-05-09 | 2016-08-14 | [
"cond-mat"
] | K. Stokbro, N. Chetty, K. W. Jacobsen, and J. K. N{\o}rskov |
cond-mat/9405023 | Asymmetric exclusion model for mixed ionic condustors | The ionic conductivity of mixed alkali glasses exhibits a deep minimum as a
function of the relative concentrations of the two alkali ions. To study this
behaviour we consider a simple one-dimensional model for asymmetric diffusion
of two kinds of particles. Different particles are assumed to repulse each
other. We con... | 1994-05-09 | 2008-02-03 | [
"cond-mat"
] | Sven Sandow, Steffen Trimper, David Mukamel |
cond-mat/9405019 | An Effective-Medium Tight-Binding Model for Silicon | A new method for calculating the total energy of Si systems is presented. The
method is based on the effective-medium theory concept of a reference system.
Instead of calculating the energy of an atom in the system of interest a
reference system is introduced where the local surroundings are similar. The
energy of the ... | 1994-05-09 | 2016-08-14 | [
"cond-mat"
] | K. Stokbro, N. Chetty, K. W. Jacobsen, and J. K. N{\o}rskov |
cond-mat/9405021 | Planar random networks with flexible fibers | The transition in random fiber networks from two-dimensional to
three-dimensional planar structure driven by increasing coverage (total fiber
length per unit area) is studied with a deposition model. At low coverage the
network geometry depends on the scale-free product of fiber length and coverage
while at high covera... | 1994-05-09 | 2009-10-22 | [
"cond-mat"
] | K.J. Niskanen and M.J. Alava |
cond-mat/9405020 | Nematogenic Lattice Models in One or Two Dimensions and with Long-Range
Interactions | Extending previous rigorous results, we prove existence of an ordering
transition at finite temperature for a class of nematogenic lattice models,
where spins are associated with a one- or two-dimensional lattice, and interact
via long-range potentials. | 1994-05-09 | 2019-08-17 | [
"cond-mat"
] | N. Angelescu, S. Romano, V.A. Zagrebnov |
cond-mat/9405016 | Generalized $t$-$j$ Model | By parameterizing the t-j model we present a new electron correlation model
with one free parameter for high-temperature superconductivity. This model is
of $SU_{q}(1,2)$ symmetry. The energy spectrums are shown to be modulated by
the free parameter in the model. The solution and symmetric structures of the
Hilbert spa... | 1994-05-06 | 2009-10-22 | [
"cond-mat",
"hep-th"
] | Shao-Ming Fei and Rui-Hong Yue |
cond-mat/9405015 | On the Formation of Transient (Na$_{19}$)$_2$ and (Na$_{20}$)$_2$
Cluster Dimers from Molecular Dynamics Simulations | By using tight binding molecular dynamics simulations, we discuss the
possibilities to form (Na$_{19}$)$_2$ and (Na$_{20}$)$_2$ cluster dimers in
sodium cluster collisions. In the case of Na$_{19}$ + Na$_{19}$, we show that
the formation of a prolate dimer-like (Na$_{19}$)$_2$ maybe depend on the
initial relative orien... | 1994-05-06 | 2009-10-22 | [
"cond-mat"
] | F.S. Zhang, F. Spiegelmann, E. Suraud, V. Fraysse, R. Poteau, R.
Glowinski and F. Chatelin |
cond-mat/9405013 | Exact Solution of a One-Dimensional Multicomponent Lattice Gas with
Hyperbolic Interaction | We present the exact solution to a one-dimensional multicomponent quantum
lattice model interacting by an exchange operator which falls off as the
inverse-sinh-square of the distance. This interaction contains a variable range
as a parameter, and can thus interpolate between the known solutions for the
nearest-neighbor... | 1994-05-06 | 2016-08-14 | [
"cond-mat"
] | Bill Sutherland, Rudolf A. R\"omer and B. Sriram Shastry |
cond-mat/9405017 | Exclusion Statistics: Low-Temperature Properties, Fluctuations, Duality,
Applications | We derive some physical properties of ideal assemblies of identical particles
obeying generalized exclusion statistics. We discuss fluctuations, and in this
connection point out a fundamental contrast to conventional quantum statistics.
We demonstrate a duality relating the distribution of particles at statistics
$g$ t... | 1994-05-06 | 2008-02-03 | [
"cond-mat"
] | Frank Wilczek and Chetan Nayak |
cond-mat/9405012 | Critical behavior of nonequilibrium models with infinitely many
absorbing states | I study the critical behavior of a two-dimensional dimer-trimer lattice
model, introduced by K\"{o}hler and ben-Avraham [J. Phys. A {\bf 24}, L621
(1991)], for heterogeneous catalysis of the reaction
$\frac{1}{2}A_{2}+\frac{1}{3}B_{3} \rightarrow AB$. The model possesses
infinitely many absorbing states in which the la... | 1994-05-06 | 2015-06-25 | [
"cond-mat"
] | Iwan Jensen |
cond-mat/9405014 | Effect of the Coulomb repulsion on the {\it ac} transport through a
quantum dot | We calculate in a linear response the admittance of a quantum dot out of
equilibrium. The interaction between two electrons with opposite spins
simultaneously residing on the resonant level is modeled by an Anderson
Hamiltonian. The electron correlations lead to the appearence of a new feature
in the frequency dependen... | 1994-05-06 | 2009-10-22 | [
"cond-mat"
] | T. Ivanov, V. Valtchinov, and L. T. Wille |
cond-mat/9405011 | Exotic and conventional superconductivity in a Dirac supersymmetric
scheme | A new pairing theory for many-fermion systems is obtained via the Dirac
supersymmetry framework recently introduced to describe Dirac particles in
external potentials. It is shown that the standard Bogoliubov-Valatin canonical
transformation treatment of the quasi-particle BCS singlet pairing mechanism
naturally falls ... | 1994-05-05 | 2016-08-14 | [
"cond-mat",
"hep-th"
] | M. Moreno, R. M. M\'endez-Moreno, S. Orozco and M. A. Ort\'iz and M.
de Llano |
cond-mat/9405007 | Interfaces and Lower Critical Dimension in a Spin Glass Model | In this paper we try to estimate the lower critical dimension for replica
symmetry breaking in spin glasses through the calculation of the additional
free-energy required to create a domain wall between two different phases. This
mechanism alone would say that replica symmetry would be restored at the lower
critical di... | 1994-05-04 | 2009-10-22 | [
"cond-mat"
] | S. Franz, G. Parisi, M.A. Virasoro |
cond-mat/9405008 | Scaling laws and simulation results for the self--organized critical
forest--fire model | We discuss the properties of a self--organized critical forest--fire model
which has been introduced recently. We derive scaling laws and define critical
exponents. The values of these critical exponents are determined by computer
simulations in 1 to 8 dimensions. The simulations suggest a critical dimension
$d_c=6$ ab... | 1994-05-04 | 2009-10-22 | [
"cond-mat"
] | S. Clar, B. Drossel, and F. Schwabl |
cond-mat/9405010 | Conductance Distributions in Random Resistor Networks: Self Averaging
and Disorder Lengths | The self averaging properties of conductance $g$ are explored in random
resistor networks with a broad distribution of bond strengths
$P(g)\simg^{\mu-1}$. Distributions of equivalent conductances are estimated
numerically on hierarchical lattices as a function of size $L$ and distribution
tail parameter $\mu$. For netw... | 1994-05-04 | 2009-10-22 | [
"cond-mat"
] | R. F. Angulo and E. Medina |
cond-mat/9405006 | Critical Exponents for Branching Annihilating Random Walks with an Even
Number of Offspring | Recently, Takayasu and Tretyakov [Phys. Rev. Lett. {\bf 68}, 3060 (1992)],
studied branching annihilating random walks (BAW) with $n=1$-5 offspring. These
models exhibit a continuous phase transition to an absorbing state. For odd $n$
the models belong to the universality class of directed percolation. For even
$n$ the... | 1994-05-04 | 2009-10-22 | [
"cond-mat"
] | Iwan Jensen |
cond-mat/9405009 | Tricritical behavior of the frustrated XY antiferromagnet | Extensive histogram Monte-Carlo simulations of the XY antiferromagnet on a
stacked triangular lattice reveal exponent estimates which strongly favor a
scenario of mean-field tricritical behavior for the spin-order transition. The
corresponding chiral-order transition occurs at the same temperature but
appears to be dec... | 1994-05-04 | 2009-10-22 | [
"cond-mat"
] | M.L. Plumer, A. Mailhot, and A. Caill\'e (Centre de Recherche en
Physique du Solide et D\'epartement de Physique, Universit\'e de Sherbrooke,
Sherbrooke, Qu\'ebec, Canada) |
cond-mat/9405003 | Scaling and Crossover in the Large-N Model for Growth Kinetics | The dependence of the scaling properties of the structure factor on space
dimensionality, range of interaction, initial and final conditions, presence or
absence of a conservation law is analysed in the framework of the large-N model
for growth kinetics. The variety of asymptotic behaviours is quite rich,
including sta... | 1994-05-03 | 2009-10-22 | [
"cond-mat"
] | Antonio Coniglio, Patrizia Ruggiero and Marco Zannetti |
cond-mat/9405004 | Tunneling and the Band Structure of Chaotic Systems | We compute the dispersion laws of chaotic periodic systems using the
semiclassical periodic orbit theory to approximate the trace of the powers of
the evolution operator. Aside from the usual real trajectories, we also include
complex orbits. These turn out to be fundamental for a proper description of
the band structu... | 1994-05-03 | 2009-10-22 | [
"cond-mat",
"chao-dyn",
"nlin.CD"
] | P. Leboeuf & A. Mouchet |
cond-mat/9405005 | Electron-Electron Interactions and the Hall-Insulator | Using the Kubo formula, we show explicitly that a non-interacting electron
system can not behave like a Hall-insulator, {\it ie.,} a DC resistivity matrix
$\rho_{xx}\rightarrow\infty$ and $\rho_{xy}=$finite in the zero temperature
limit, as has been observed recently in experiment. For a strongly interacting
electron s... | 1994-05-03 | 2009-10-22 | [
"cond-mat"
] | Lian Zheng, and H.A. Fertig |
cond-mat/9405001 | Comment on "Evolution from BCS Superconductivity to Bose-Einstein
Condensation: Role of the Parameter $k_{\rm F} \xi$ in Interpreting the
Experimental Plot by Uemura et al.''} | The problem of crossover from BCS to Bose-Einstein condensation has recently
attracted considerable interest owing to the discovery of high-$T_{\rm c}$
cuprates. Their short coherence length, $\xi$, places these materials in the
interesting region between BCS and Bose-Einstein condensation. In the paper of
F. Pistolesi... | 1994-05-02 | 2016-08-16 | [
"cond-mat"
] | J.J. Rodr\'iguez-N\'u\~nez, S. Schafroth, T. Schneider, M.H. Pedersen
and C. Rossel |
cond-mat/9405002 | Metal-insulator and insulator-insulator transitions in the
quarter-filled band organic conductors | The theory of the 2k_F and 4k_F instabilities in quarter-filled band organic
conductors is revisited. The phase angles of the 2k_F bond and charge density
waves are shown to change as electron correlation is turned on, and this
switching of the phase angle is critical for understanding the bond distortion
patterns in t... | 1994-05-02 | 2009-10-22 | [
"cond-mat"
] | K.C. Ung, S. Mazumdar, and D.Toussaint |
cond-mat/9404101 | Manifolds in random media: A variational approach to the spatial
probability distribution | We develop a new variational scheme to approximate the position dependent
spatial probability distribution of a zero dimensional manifold in a random
medium. This celebrated 'toy-model' is associated via a mapping with directed
polymers in 1+1 dimension, and also describes features of the
commensurate-incommensurate ph... | 1994-05-02 | 2009-10-22 | [
"cond-mat"
] | Yadin Y. Goldschmidt |
cond-mat/9404100 | The Density Matrix Renormalization Group for Fermion Systems | We discuss techniques of the density matrix renormalization group and their
application to interacting fermion systems in more than one dimension. We show
numerical results for equal--time spin--spin and singlet pair field correlation
functions, as well as the spin gap for the Hubbard model on two chains. The
system is... | 1994-04-30 | 2007-05-23 | [
"cond-mat"
] | R.M. Noack, S.R. White, and D.J. Scalapino |
cond-mat/9404098 | Energy cost associated with vortex crossing in superconductors | Starting from the Ginzburg-Landau free energy of a type II superconductor in
a magnetic field we estimate the energy associated with two vortices crossing.
The calculations are performed by assuming that we are in a part of the phase
diagram where the lowest Landau level approximation is valid. We consider only
two vor... | 1994-04-29 | 2009-10-22 | [
"cond-mat"
] | M.A. Moore and N.K. Wilkin |
cond-mat/9404099 | Quantumdots | Atomic-like systems in which electronic motion is two dimensional are now
realizable as ``quantum dots''. In place of the attraction of a nucleus there
is a confining potential, usually assumed to be quadratic. Additionally, a
perpendicular magnetic field $B$ may be present. We review some recent rigorous
results for t... | 1994-04-29 | 2007-05-23 | [
"cond-mat"
] | E. H. Lieb, J. P. Solovej and J. Yngvason |
cond-mat/9404096 | Thermodynamics of an one-dimensional ideal gas with fractional exclusion
statistics | We show that the particles in the Calogero-Sutherland Model obey fractional
exclusion statistics as defined by Haldane. We construct anyon number densities
and derive the energy distribution function. We show that the partition
function factorizes in the form characteristic of an ideal gas. The virial
expansion is exac... | 1994-04-29 | 2009-10-22 | [
"cond-mat"
] | M.V.N.Murthy and R.Shankar |
cond-mat/9404097 | Numerical Renormalization Group Study of Pseudo-Fermion and Slave-Boson
Spectral Functions in the Single Impurity Anderson Model | We use the numerical renormalization group to calculate the auxiliary
spectral functions of the $U=\infty$ Anderson impurity model. The slave--boson
and pseudo--fermion spectral functions diverge at the threshold with exponents
$\alpha_{b}$ and $\alpha_{f}$ given in terms of the conduction electron phase
shifts by the ... | 1994-04-29 | 2009-10-22 | [
"cond-mat"
] | T. A. Costi, P. Schmitteckert, J. Kroha and P. Woelfle |
cond-mat/9404090 | A microscopic approach to the dimerization in the frustrated spin-1/2
antiferromagnetic chains | The spontaneous dimerization of the frustrated spin-$1\over2$
antiferromagnetic chains is studied by a microscopic approach based on a proper
set of composite operators (i.e., pseudo-spin operators). Two approximation
schemes are developed. Firstly, a spin-wave approximation is made by a
Dyson-Mal\'eev-like boson trans... | 1994-04-28 | 2009-10-22 | [
"cond-mat"
] | Yang Xian |
cond-mat/9404092 | Binding of Holes to Magnetic Impurities in a Strongly Correlated System | The effect of a magnetic (S=1/2) impurity coupled to a 2D system of
correlated electrons (described by the t--J model) is studied by exact
diagonalisations. It is found that, if the exchange coupling of the impurity
with the neighboring spins is ferromagnetic or weakly antiferromagnetic, an
extra hole can form bound st... | 1994-04-28 | 2016-08-31 | [
"cond-mat"
] | D. Poilblanc, D. J. Scalapino, and W. Hanke |
cond-mat/9404093 | Dynamics of N-spins Quantum Ferromagnet with Uniform Exchange: Exact
Solution | The transverse spin autocorrelation function at an arbitrary temperature are
calculated rigorously for the system of $N$ uniformly exchanged quantum spins.
At large $N$ the correlator in the para-phase is found to have a Gaussian bump
at small times and a non vanishing tail at large times. A possible application
of tho... | 1994-04-28 | 2007-05-23 | [
"cond-mat"
] | M. Chertkov and I. Kolokolov |
cond-mat/9404095 | t-J model Studied by the New Lanczos-Power Method | The initial trial wave function used in a simple ground-state projection
method, the power method, is systematically improved by using Lanczos
algorithm. Much faster convergence to the ground state achieved by using these
wave functions significantly reduces the effect of the fermion sign problem.
The energy, spin and ... | 1994-04-28 | 2009-10-22 | [
"cond-mat"
] | Y. C. Chen and T. K. Lee |
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