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Condensed Matter papers — page 183

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Nonstationary Stochastic Resonance
It is by now established that, remarkably, the addition of noise to a nonlinear system may sometimes facilitate, rather than hamper the detection of weak signals. This phenomenon, usually referred to…
Redouane FakirMar 24, 1998
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Nonstationary Stochastic Resonance in a Single Neuron-Like System
Stochastic resonance holds much promise for the detection of weak signals in the presence of relatively loud noise. Following the discovery of nondynamical and of aperiodic stochastic resonance, it…
Redouane FakirMar 23, 1998
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A geometric generalization of field theory to manifolds of arbitrary dimension
We introduce a generalization of the O(N) field theory to N-colored membranes of arbitrary inner dimension D. The O(N) model is obtained for D->1, while N->0 leads to self-avoiding tethered membranes…
Kay Joerg Wiese, Mehran KardarMar 23, 1998
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Perturbation Theory for Singular Potentials in Quantum Mechanics
We study perturbation theory in certain quantum mechanics problems in which the perturbing potential diverges at some points, even though the energy eigenvalues are smooth functions of the…
Diptiman SenMar 23, 1998
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Addendum to paper: Strong-Coupling Behavior of ϕ4-Theories and Critical Exponents [Phys. Rev. D 57, 2264 (1998)]
The graphical extrapolation procedure to infinite order of variational perturbation theory in a recent calculation of critical exponents of three-dimensional ϕ4-theories at infinite couplings is…
Hagen KleinertMar 22, 1998
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Universal Spin Response in Copper Oxide Materials
The spin response in the copper oxide materials at finite temperatures in the underdoped and optimal doped regimes is studied within the framework of the fermion-spin theory. The integrated dynamical…
Shiping Feng, Zhongbing HuangMar 20, 1998
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Transitions between Phases with Equal Wave Numbers in a Double Ising Spin Model. Application to Betaine Calcium Chloride Dihydrate
A Double Ising Spin model for uniaxially structurally modulated materials exhibits as a special feature phase transitions between phases with equal wave numbers but different pseudo spin…
Boris Neubert, Michel Pleimling, Rolf SiemsMar 20, 1998
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Analysis of data sets of stochastic systems
This paper deals with the analysis of stochastic systems which can be described by a Langevin equation. By the method presented in this paper drift and diffusion terms of the corresponding…
S. Siegert, R. Friedrich, J. PeinkeMar 20, 1998
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Scaling Function for the Critical Specific Heat in a Confined Geometry : Spherical Limit
The scaling function for the critical specific heat is obtained exactly for temperatures above the bulk transition temperature by working in the spherical limit. Generalization of the function to…
Saugata Bhattacharyya, J. K. BhattacharjeeMar 20, 1998
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Critical Ultrasonics Near the Superfluid Transition : Finite Size Effects
The suppression of order parameter fluctuations at the boundaries causes the ultrasonic attenuation near the superfluid transition to be lowered below the bulk value. We calculate explicitly the…
Saugata Bhattacharyya, J. K. BhattacharjeeMar 20, 1998
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Intensity distribution for waves in disordered media: deviations from Rayleigh statistics
We study the intensity distribution function, P(I), for monochromatic waves propagating in quasi one-dimensional disordered medium, assuming that a point source and a point detector are embedded in…
A. D. Mirlin, R. Pnini, B. ShapiroMar 20, 1998
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Two-dimensional Coulomb systems on a surface of constant negative curvature
We study the equilibrium statistical mechanics of classical two-dimensional Coulomb systems living on a pseudosphere (an infinite surface of constant negative curvature). The Coulomb potential…
B. Jancovici, G. TellezMar 20, 1998
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Vortices and the Ginzburg-Landau phase transition
The methods for studying the role of vortex loops in the phase transition of the Ginzburg-Landau theory of superconductivity using lattice Monte Carlo simulations are discussed. Gauge-invariant…
A. RajantieMar 18, 1998
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Gauge invariant grid discretization of Schrödinger equation
Using the Wilson formulation of lattice gauge theories, a gauge invariant grid discretization of a one-particle Hamiltonian in the presence of an external electromagnetic field is proposed. This…
M. Governale, C. UngarelliMar 18, 1998
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Spinor Bose Condensates in Optical Traps
In an optical trap, the ground state of spin-1 Bosons such as 23Na, 39K, and 87Rb can be either a ferromagnetic or a "polar" state, depending on the scattering lengths in…
Tin-Lun HoMar 18, 1998
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Elimination of unoccupied state summations in ab-initio self-energy calculations for large supercells
We present a new method for the computation of self-energy corrections in large supercells. It eliminates the explicit summation over unoccupied states, and uses an iterative scheme based on an…
Lucia Reining, Giovanni Onida, R. W. GodbyMar 18, 1998
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Analytical expressions for the local-field factor G(q) and the exchange-correlation kernel Kxc(r) of the homogeneous electron gas
We present an analytical expression for the local field factor G(q) of the homogeneous electron gas which reproduces recently published Quantum Monte--Carlo data by S. Moroni, D.M. Ceperley, and G.…
Massimiliano Corradini, Rodolfo Del Sole, Giovanni Onida et al.Mar 18, 1998
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Dynamics of Dry Friction: A Numerical Investigation
We perform extended numerical simulation of the dynamics of dry friction, based on a model derived from the phenomenological description proposed by T. Baumberger et al.. In the case of small…
Y. F. Lim, Kan ChenMar 18, 1998
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Analytical description of a trapped semi-ideal Bose gas at finite temperature
Present experiments with Bose condensed gases can be largely described by a semi-ideal two-gas model. In this model, the condensate is influenced only by the mean-field repulsion among condensed…
M. Naraschewski, D. M. Stamper-KurnMar 18, 1998
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Algebraic Bethe ansatz for the supersymmetric t-J model with reflecting boundary conditions
In the framework of the graded quantum inverse scattering method (QISM), we obtain the eigenvalues and eigenvectors of the supersymmetric t-J model with reflecting boundary conditions in FFB…
Heng Fan, Bo-yu Hou, Kang-jie ShiMar 18, 1998
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Dispersion relations and speeds of sound in special sectors for the integrable chain with alternating spins
Based on our previous analysis doerfel3 of the anisotropic integrable chain consisting of spins s=1/2 and s=1 we compare the dispersion relations for the sectors with infinite Fermi zones.…
B. -D. Doerfel, St. MeissnerMar 17, 1998
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Diffusion Quantum Monte Carlo Calculations of Excited States of Silicon
The band structure of silicon is calculated at the Gamma, X, and L wave vectors using diffusion quantum Monte Carlo methods. Excited states are formed by promoting an electron from the valence band…
A. J. Williamson, Randolph Q. Hood, R. J. Needs et al.Mar 17, 1998
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Surface Screening Charge and Effective Charge
The charge on an atom at a metallic surface in an electric field is defined as the field-derivative of the force on the atom, and this is consistent with definitions of effective charge and screening…
S. Clarke, J. E. Inglesfield, M. Nekovee et al.Mar 16, 1998
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Jamming, Force Chains and Fragile Matter
We consider materials whose mechanical integrity is the result of a jamming process. We argue that such media are generically "fragile": unable to support certain types of incremental loading…
M. E. Cates, J. Wittmer, J. P. Bouchaud et al.Mar 16, 1998
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Rod-like Polyelectrolytes in Presence of Monovalent Salt
We investigate the properties of rigid polyelectrolyte solutions in presence of monovalent salt. The free energy within the Debye-Hückel-Bjerrum (DHBj) theory [M. E. Fisher and Y. Levin, Phys.…
Paulo S. Kuhn, Yan Levin, Marcia C. BarbosaMar 16, 1998
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