Skip to content

Condensed Matter papers — page 201

cond-matBrowse archive

Influence of magnetic impurities on the heat capacity of nuclear spins
It is found that in a wide range of temperatures and magnetic fields even a small concentration of magnetic impurities in a sample leads to a T-1 temperature dependence of the nuclear heat…
A. M. Dyugaev, Yu. N. Ovchinnikov, P. FuldeSep 3, 1997
Learn
Excitations of a Bose-condensed gas in anisotropic traps
We investigate the zero-temperature collective excitations of a Bose-condensed atomic gas in anisotropic parabolic traps. The condensate density is determined by solving the Gross-Pitaevskii (GP)…
D. A. W. Hutchinson, E. ZarembaSep 3, 1997
Learn
Shaping an ultracold atomic soliton in a travelling wave laser beam
An ultracold wave packet of bosonic atoms loaded into a travelling laser wave may form a many-atom soliton.This is disturbed by a homogeneous force field, for example by the inevitable gravitation.…
Markus Holzmann, Juergen AudretschSep 3, 1997
Learn
Coulomb Drag in Systems with Tunneling Bridges
We study the Coulomb drag effect in double layer electronic systems with local tunneling links. The possibility of tunneling between the layers leads to a pronounced exchange contribution to the…
Yuval Oreg, Alex KamenevSep 3, 1997
Learn
Phase Transitions in One-Dimensional Truncated Bosonic Hubbard Model and Its Spin-1 Analog
We study one-dimensional truncated (no more than 2 particles on a site) bosonic Hubbard model in both repulsive and attractive regimes by exact diagonalization and exact worldline Monte Carlo…
V. A. Kashurnikov, A. V. Krasavin, B. V. SvistunovSep 3, 1997
Learn
Evolution of Correlation Properties and Appearance of Broken Symmetry in the Process of Bose-Einstein Condensation
We consider the self-evolution of strongly non-equilibrium interacting Bose gas. Due to the mere fact of large (as compared to unity) occupation numbers in the initial state the problem is directly…
Yu. Kagan, B. V. SvistunovSep 3, 1997
Learn
First Passage Times and Time-Temperature-Transformation curves for Martensites
Martensites are long-lived nonequilibrium structures produced following a quench across a solid state structural transition. In a recent paper (Phys. Rev. Lett. 78, 2168 (1997)), we had described a…
Madan Rao, Surajit SenguptaSep 2, 1997
Learn
Spectral properties of the 2D Holstein polaron
The two-dimensional Holstein model is studied by means of direct Lanczos diagonalization preserving the full dynamics and quantum nature of phonons. We present numerical exact results for the…
H. Fehske, J. Loos, G. WelleinSep 1, 1997
Learn
Frequency shift and mode coupling in the nonlinear dynamics of a Bose condensed gas
We investigate the behavior of large amplitude oscillations of a trapped Bose-condensed gas of alkali atoms at zero temperature, by solving the equations of hydrodynamics for collective modes. Due to…
F. Dalfovo, C. Minniti, L. P. PitaevskiiSep 1, 1997
Learn
Topological Phenomena in Normal Metals
This paper is devoted to topological phenomena in normal metals with rather complicated Fermi surface. The results of the article are based on the deep topological theorems concerning the geometry of…
S. P. Novikov, A. Ya. MaltsevSep 1, 1997
Learn
Nonlinear Magneto-Optics of Fe Monolayers from first principles: Structural dependence and spin-orbit coupling strength
We calculate the nonlinear magneto-optical response of free-standing fcc (001), (110) and (111) oriented Fe monolayers. The bandstructures are determined from first principles using a full-potential…
J. P. Dewitz, Jian Chen, W. HübnerSep 1, 1997
Learn
Sound propagation in a cylindrical Bose-condensed gas
We study the normal modes of a cylindrical Bose condensate at T = 0 using the linearized time-dependent Gross-Pitaevskii equation in the Thomas-Fermi limit. These modes are relevant to the recent…
E. ZarembaAug 29, 1997
Learn
A simple model of epitaxial growth
A discrete solid-on-solid model of epitaxial growth is introduced which, in a simple manner, takes into account the effect of an Ehrlich-Schwoebel barrier at step edges as well as the local…
M. Biehl, W. Kinzel, S. SchinzerAug 29, 1997
Learn
Real Time Dynamics of Soliton Diffusion
We study the non-equilibrium dynamics of solitons in model Hamiltonians for Peierls dimerized quasi-one dimensional conducting polymers and commensurate charge density wave systems. The real time…
S. M. Alamoudi, D. Boyanovsky, F. I. TakakuraAug 29, 1997
Learn
Modeling sublimation by computer simulation: morphology dependent effective energies
Solid-On-Solid (SOS) computer simulations are employed to investigate the sublimation of surfaces. We distinguish three sublimation regimes: layer-by-layer sublimation, free step flow and hindered…
Stefan Schinzer, Wolfgang KinzelAug 28, 1997
Learn
Bose-Einstein Condensation in a Confined Geometry with and without a Vortex
Various widely-used mean-field type theories for a dilute Bose gas are critically examined in the light of the recent discovery of Bose-Einstein condensation of atomic gases in a confined geometry.…
Tomoya Isoshima, Kazushige MachidaAug 27, 1997
Learn
Effect of electron correlation on phonons in a strongly-coupled electron-phonon system
An asymptotically exact result is obtained for the renormalized phonon energy as a function of the on-site Coulomb repulsion Uee in the half-filled Hubbard-Holstein model in the strong-coupling…
Takashi Hotta, Yasutami TakadaAug 26, 1997
Learn
Effective Hamiltonian in the Problem of a "Central Spin" Coupled to a Spin Environment
We consider here the problem of a "giant spin", with spin quantum number S>>1, interacting with a set of microscopic spins. Interactions between the microscopic spins are ignored. This model…
I. S. Tupitsyn, N. V. Prokof'ev, P. C. E. StampAug 26, 1997
Learn
Large N behavior of Non-Ohmic Tunnel Junctions
Non-Ohmic tunnel junctions are believed to occur in systems where the exciton and orthogonality catastrophe effects significantly modify tunneling rates. Here we present a simple non-perturbative…
S. R. RennAug 25, 1997
Learn
Effects of Phonons and Nuclear Spins on the Tunneling of a Domain Wall
We consider the quantum dynamics of a magnetic domain wall at low temperatures, where dissipative couplings to magnons and electrons are very small. The wall motion is then determined by its coupling…
M. Dube, P. C. E. StampAug 25, 1997
Learn
Creation of vortices in a Bose-Einstein condensate by a Raman technique
We propose a method for taking a Bose-Einstein condensate in the ground trap state simultaneously to a different atomic hyperfine state and to a vortex trap state. This can be accomplished through a…
Eric L. Bolda, Dan F. WallsAug 25, 1997
Learn
Flux Line Lattices in Artificially Layered Superconductors
The flux line lattice of superconductors has been investigated when there exists a periodicity in the underlying system, such as can occur in artificially layered structures. For small fields…
A. M. Thompson, M. A. MooreAug 23, 1997
Learn
Scaling Behavior in the Stable Marriage Problem
We study the optimization of the stable marriage problem. All individuals attempt to optimize their own satisfaction, subject to mutually conflicting constraints. We find that the stable solutions…
M. J. Omero, M. Dzierzawa, M. Marsili et al.Aug 22, 1997
Learn
A Path Integral Approach to Option Pricing with Stochastic Volatility: Some Exact Results
The Black-Scholes formula for pricing options on stocks and other securities has been generalized by Merton and Garman to the case when stock volatility is stochastic. The derivation of the price of…
B. E. BaaquieAug 22, 1997
Learn
Theory of Photoemission from the Copper Oxide Material
A mean-field theory which satisfying the electron on-site local constraint in the relevant regime of density for the high temperature superconductors is developed. Within this approach, the electron…
Shiping Feng, Yun SongAug 22, 1997
Learn
← PreviousPage 201Next →