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Condensed Matter papers — page 185

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The Cumulant Expansion for the Anderson Lattice with Finite U: The Completeness Problem
``Completeness'' (i.e. probability conservation) is not usually satisfied in the cumulant expansion of the Anderson lattice when a reduced state space is employed for U ∞ . To…
M. E. Foglio, M. S. FigueiraFeb 27, 1998
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Fluctuation-induced phase in CsCuCl3 in transverse magnetic field: Theory
CsCuCl3 is a quantum triangular antiferromagnet, ferromagnetically stacked, with an incommensurate (IC) structure due to a Dzyaloshinskii-Moriya interaction. Because of the classical degeneracy…
A. E. Jacobs, Tetsuro NikuniFeb 27, 1998
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Statistics of S-matrix poles for chaotic systems with broken time reversal invariance: a conjecture
In the framework of a random matrix description of chaotic quantum scattering the positions of S-matrix poles are given by complex eigenvalues Zi of an effective non-Hermitian random-matrix…
Yan V. Fyodorov, Mikhail Titov, H. -J. SommersFeb 27, 1998
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Fokker-Planck Equations for Nucleation Processes Revisited
We present a new approach to analyze homogeneous nucleation based on non-equilibrium thermodynamics. The starting point is the formulation of a Gibbs equation for the variations of the entropy of the…
D. Reguera Lopez, J. M. Rubi, A. Perez-MadridFeb 27, 1998
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Correlation functions in the Calogero-Sutherland model with open boundaries
Calogero-Sutherland models of type BCN are known to be relevant to the physics of one-dimensional quantum impurity effects. Here we represent certain correlation functions of these models in terms…
Holger Frahm, Sergey I. MatveenkoFeb 26, 1998
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Electron renormalization of sound interaction with two-level systems in superconducting metglasses
The crossing of temperature dependences of the sound velocity in normal and superconducting state of metallic glasses points out unambiguously the renormalization of the intensity of sound…
E. V. Bezuglyi, A. L. Gaiduk, V. D. Fil et al.Feb 26, 1998
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Resistivity due to low-symmetrical defects in metals
The impurity resistivity, also known as the residual resistivity, is calculated ab initio using multiple-scattering theory. The mean-free path is calculated by solving the Boltzmann equation…
J. P. Dekker, A. Lodder, J. van EkFeb 26, 1998
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Identification of Non-unitary triplet pairing in a heavy Fermion superconductor UPt3
A NMR experiment recently done by Tou et al. on a heavy Fermion superconductor UPt3 is interpreted in terms of a non-unitary spin-triplet pairing state which we have been advocating. The proposed…
Kazushige Machida, Tetsuo OhmiFeb 26, 1998
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Instability of charge ordered states in doped antiferromagnets
We analyze the induced interactions between localized holes in weakly-doped Heisenberg antiferromagnets due to the modification of the quantum zero point spin wave energy; i.e. the analogue of the…
Leonid P. Pryadko, Steven Kivelson, Daniel W. HoneFeb 26, 1998
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Transition from Poisson to gaussian unitary statistics: The two-point correlation function
We consider the Rosenzweig-Porter model of random matrix which interpolates between Poisson and gaussian unitary statistics and compute exactly the two-point correlation function. Asymptotic formulas…
H. Kunz, B. ShapiroFeb 25, 1998
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Destruction of Strong Critical Spin Fluctuations by Doping in the 2D Hubbard Model
We present the doping dependence of the spectral functions, density of states and low frequency behavior of the self-energy for the 2D Hubbard model on the basis of our recently developed theory for…
Bumsoo KyungFeb 25, 1998
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Electromagnetic forces in photonic crystals
We develop a general methodology for numerical computations of electromagnetic (EM) fields and forces in matter, based on solving the macroscopic Maxwell's equations in real space and adopting…
M. I. Antonoyiannakis, J. B. PendryFeb 24, 1998
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Band Kondo Effect in the Doped 2D Hubbard Model
We present strong numerical evidence for the band Kondo effect in the doped 2D Hubbard model by showing the systematic change of the density of states, imaginary part of the self-energy, effective…
Bumsoo KyungFeb 24, 1998
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Excitation spectrum and instability of a two-species Bose-Einstein condensate
We numerically calculate the density profile and excitation spectrum of a two-species Bose-Einstein condensate for the parameters of recent experiments. We find that the ground state density profile…
D. Gordon, C. M. SavageFeb 24, 1998
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DMRG Calculations of the Low-lying Excitations and Nonlinear Optical Properties of poly(para-phenylene)
The two state molecular orbital (2-MO) model of the phenyl based semiconductors is used to calculate the low-lying spectra of the Ag and Bu states of poly(para-phenylene) (PPP). The model parameters…
W. Barford, R. J. Bursill, M. Yu. LavrentievFeb 23, 1998
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Distributions of gaps and end-to-end correlations in random transverse-field Ising spin chains
A previously introduced real space renormalization-group treatment of the random transverse-field Ising spin chain is extended to provide detailed information on the distribution of the energy gap…
Daniel S. Fisher, A. P. YoungFeb 23, 1998
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Quantum Field Theory of Vortices in Superfluid Films
A quantum field theory, consisting of the effective action of sound waves linearly coupled to a Chern-Simons term, is proposed to describe the dynamics of vortices in a superfluid film at the…
Joerg P. Kottmann, Adriaan M. J. SchakelFeb 23, 1998
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The many-Electron Problem in Novel Low-Dimensional Materials
This work deals with the one-dimensional Hubbard model. It has seven chapters: 1. Introduction; 2. The Hubbard Model; 3. Algebraic Representation for the Hilbert Space of the 1D Hubbard Model; 4.…
N. M. R. PeresFeb 23, 1998
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Density-Induced Breaking of Pairs in the Attractive Hubbard Model
A conserving T-matrix approximation is applied to the two-dimensional attractive Hubbard model in the low-density regime. A set of self-consistent equations is solved in the real-frequency domain to…
Bumsoo Kyung, E. G. Klepfish, P. E. KornilovitchFeb 23, 1998
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Scattering of He-3 Atoms from He-4 Surfaces
We develop a first principles, microscopic theory of impurity atom scattering from inhomogeneous quantum liquids such as adsorbed films, slabs, or clusters of He-4. The theory is built upon a…
E. Krotscheck, R. ZillichFeb 21, 1998
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The Relevant Operators for the Hubbard Hamiltonian with a magnetic field term
The Hubbard Hamiltonian and its variants/generalizations continue to dominate the theoretical modelling of important problems such as high temperature superconductivity. In this note we identify the…
S. Alam, M. Nasir Khan, Jauhar AliFeb 21, 1998
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Phase diagram of the one-dimensional Holstein model of spinless fermions
The one-dimensional Holstein model of spinless fermions interacting with dispersionless phonons is studied using a new variant of the density matrix renormalisation group. By examining various…
R. J. Bursill, R. H. McKenzie, C. J. HamerFeb 20, 1998
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Identification of excitons in conjugated polymers: a density matrix renormalisation group study
This work addresses the question of whether low-lying excitations in conjugated polymers are comprised of free charge-carriers or excitons. States are characterised as bound or unbound according to…
M. Boman, R. J. BursillFeb 20, 1998
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Density of kinks just after a quench in an overdamped system
A quench in an overdamped one dimensional ϕ4 model is studied by analytical and numerical methods. For an infinite system or a finite system with free boundary conditions, the density of kinks…
Jacek DziarmagaFeb 19, 1998
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Low temperature phase diagram and critical behaviour of the four-state chiral clock model
The low temperature behaviour of the four-state chiral clock (CC4) model is reexamined using a systematic low temperature series expansion of the free energy. Previously obtained results for the…
M. Pleimling, B. Neubert, R. SiemsFeb 19, 1998
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