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Condensed Matter papers — page 211

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Topological asymmetry in the damping-pairing contribution of electron-boson scattering
We make a harmonic analysis of the pairing and damping contribution of a finite k range isotropic electron-phonon (or other boson) scattering in an anisotropic two-dimensional electronic system. We…
Georgios Varelogiannis, Martin PeterMay 8, 1997
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Density of Superfluid Helium Droplets
The classical integral cross sections of large superfluid 4HeN droplets and the number of atoms in the droplets (N=103-104) have been measured in molecular beam scattering experiments. These…
Jan Harms, J. Peter Toennies, Franco DalfovoMay 8, 1997
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Level statistics and localization in a 2D quantum percolation problem
A two dimensional model for quantum percolation with variable tunneling range is studied. For this purpose the Lifshitz model is considered where the disorder enters the Hamiltonian via the…
M. Letz, K. ZieglerMay 6, 1997
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Vortex Velocity Pair Correlations
The vortex velocity probability distribution for two distinct vortices is determined for the case of phase-ordering kinetics in systems with point defects. The n-vector model driven by time-dependent…
Gene F. MazenkoMay 6, 1997
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Far from equilibrium dynamics of the Bose gas
We study the approach to equilibrium of a Bose gas to a superfluid state. We point out that dynamic scaling, characteristic of far from equilibrium phase-ordering systems, should hold. We stress the…
Kedar Damle, Satya N. Majumdar, Subir SachdevMay 6, 1997
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Universality of correlation functions of hermitian random matrices in an external field
The behavior of correlation functions is studied in a class of matrix models characterized by a measure (-S) containing a potential term and an external source term: S=N(V(M)-MA). In the…
P. Zinn-JustinMay 6, 1997
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Charging Spectrum of a Small Wigner Crystal Island
Charging of a clean two-dimensional island is studied in the regime of small concentration of electrons when they form the Wigner crystal. The number of electrons in the island is assumed to be not…
A. A. Koulakov, B. I. ShklovskiiMay 4, 1997
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Comparison of Calculations for the Hubbard model obtained with Quantum-Monte-Carlo, exact and stochastic Diagonalization
In this paper we compare numerical results for the ground state of the Hubbard model obtained by Quantum-Monte-Carlo simulations with results from exact and stochastic diagonalizations. We find good…
Thomas Husslein, Werner Fettes, Ingo MorgensternMay 3, 1997
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Free induction signal from biexcitons and bound excitons
A theory of the free induction signal from biexcitons and bound excitons is presented. The simultaneous existence of the exciton continuum and a bound state is shown to result in a new type of time…
Emmanuel I. RashbaMay 3, 1997
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A solvable model for excitonic complexes in one dimension
It is known experimentally that stable few-body clusters containing negatively-charged electrons (e) and positively-charged holes (h) can exist in low-dimensional semiconductor nanostructures. In…
A. J. Markvardsen, N. F. JohnsonMay 2, 1997
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An exactly solved model of biological evolution
We reconsider the Eigen's quasi-species model for competing self-reproductive macromolecules in populations characterized by a single-peaked fitness landscape. The use of ideas and tools borrowed…
Stefano GalluccioMay 2, 1997
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Stability and collective excitations of a two-component Bose-condensed gas: a moment approach
The dynamics of a two-component dilute Bose gas of atoms at zero temperature is described in the mean field approximation by a two-component Gross-Pitaevskii Equation. We solve this equation assuming…
Th. Busch, J. I. Cirac, V. M. Perez-Garcia et al.May 1, 1997
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An analysis of photoemission and inverse photoemission spectra of Si(111) and sulphur-passivated InP(001) surfaces
Photoemission (PES) and inverse-photoemission spectra (IPES) for the sulphur-passivated InP(001) surface are compared with theoretical predictions based on density-functional calculations. As a test…
M. W. C. Dharma-wardana, Z. Tian, Z. H. Lu et al.May 1, 1997
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Ordering kinetics of defect structures
We show how the continuity equations expressing conservation of topological point or string defect charge can be used to determine the order-parameter correlation function for the phase-ordering…
Gene F. Mazenko, Robert A. WickhamApr 30, 1997
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Fermi Edge Singularities: Boundstates and Finite Size Effects
Fermi edge adsorption singularities (FES) are studied using a combination of conformal field theory (CFT), an exact sum rule and numerical work on a tight binding model which is shown to exhibit…
Alexandre M. Zagoskin, Ian AffleckApr 30, 1997
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Hundred photon microwave ionization of Rydberg atoms in a static electric field
We present analytical and numerical results for the microwave excitation of nonhydrogenic atoms in a static electric field when up to 1000 photons are required to ionize an atom. For small microwave…
Giuliano Benenti, Giulio Casati, Dima L. ShepelyanskyApr 30, 1997
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Pattern Formation in a 2D Elastic Solid
We present a dynamical theory of a two-dimensional martensitic transition in an elastic solid, connecting a high-temperature phase which is nondegenerate and has triangular symmetry, and a…
A. C. E. Reid, R. J. GoodingApr 29, 1997
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Coil Formation in Multishell Carbon Nanotubes: Competition between Curvature Elasticity and Interlayer Adhesion
To study the shape formation process of carbon nanotubes, a string equation describing the possible existing shapes of the axis-curve of multishell carbon tubes (MCTs) is obtained in the continuum…
Ou-Yang Zhong-can, Zhao-Bin Su, Chui-Lin WangApr 29, 1997
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Frictional Coulomb drag in strong magnetic fields
A treatment of frictional Coulomb drag between two 2-dimensional electron layers in a strong perpendicular magnetic field, within the independent electron picture, is presented. Assuming fully…
M. C. Bonsager, K. Flensberg, B. Y-K. Hu et al.Apr 28, 1997
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Exact Dynamical Structure Factor of a Bose Liquid
Based on ideas introduced in a previous preprint cond-mat/9701206 we propose an exactly solvable model of bosons interacting amongst themselves via a Van-der Waal-like repulsive interaction, and…
Girish S. SetlurApr 27, 1997
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Thermodynamics of isotropic and anisotropic layered magnets: renormalization group approach and 1/N expansion
The O(N) model of layered antiferro- and ferromagnets with a weak interlayer coupling and/or easy-axis anisotropy is considered. A renormalization group (RG) analysis in this model is performed, the…
V. Yu. Irkhin, A. A. KataninApr 27, 1997
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The Short Range RVB State of Even Spin Ladders: A Recurrent Variational Approach
Using a recursive method we construct dimer and nondimer variational ansatzs of the ground state for the two-legged ladder, and compute the number of dimer coverings, the energy density and the spin…
German Sierra, Miguel A. Martin-DelgadoApr 25, 1997
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Electron localization by a magnetic vortex
We study the problem of an electron in two dimensions in the presence of a magnetic vortex with a step-like profile. Dependending on the values of the effective mass and gyromagnetic factor of the…
R. M. Cavalcanti, E. S. Fraga, C. A. A. de CarvalhoApr 25, 1997
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Coulomb charging energy for arbitrary tunneling strength
The Coulomb energy of a small metallic island coupled to an electrode by a tunnel junction is investigated. We employ Monte Carlo simulations to determine the effective charging energy for arbitrary…
Xiaohui Wang, Reinhold Egger, Hermann GrabertApr 23, 1997
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Simple Calculation of Quantum Spin Tunneling Effects
The level splitting formulae much discussed in the study of spin tunneling in macroscopic ferromagnetic particles and previously derived only by complicated pseudoparticle methods for the ground…
J. -Q. Liang, H. J. W. Mueller-Kirsten, J. M. S. RanaApr 22, 1997
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