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Condensed Matter papers — page 100

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Monte Carlo Study of Ferromagnetism in (III,Mn)V Semiconductors
We report on Monte Carlo studies of the kinetic exchange model for (III,Mn)V ferromagnetic semiconductors in which S=5/2 local moments, representing Mn2+ ions, are exchange coupled to band…
John Schliemann, Jürgen König, A. H. MacDonaldDec 13, 2000
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A renormalized expression for the turbulent energy dissipation rate
Conditional elimination of degrees of freedom is shown to lead to an exact expression for the rate of turbulent energy dissipation in terms of a renormalized viscosity and a correction. The…
C. Johnston, W. D. McCombDec 13, 2000
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An exact correspondence between Quantum Hall Skyrmions and non linear σ-models
We show that the ground states of spin-fermions interacting by a delta repulsive potential in a strong magnetic field can be put in one to one correspondence with the solitons of the S2 non linear…
V. PasquierDec 12, 2000
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Interplay of real space and momentum space topologies in strongly correlated fermionic systems
We discuss the momentum-space topology of 3+1 and 2+1 strongly correlated fermionic systems. For the 3+1 systems the important universality class is determined by the topologically stable Fermi…
G. E. VolovikDec 12, 2000
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Algebra versus analysis in statistical mechanics and quantum field theory
I contrast the profound differences in the ways in which algebra and analysis are used in physics. In particular I discuss the fascinating phenomenon that theoretical physicists devote almost all…
Barry M. McCoyDec 12, 2000
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Molecular dynamics simulations of lead clusters
Molecular dynamics simulations of nanometer-sized lead clusters have been performed using the Lim, Ong and Ercolessi glue potential (Surf. Sci. 269/270, 1109 (1992)). The binding energies of…
S. C. Hendy, B. D. HallDec 11, 2000
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Quasicondensate and superfluid fraction in the 2D charged-boson gas at finite temperature
The Bogoliubov - de Gennes equations are solved for the Coulomb Bose gas describing a fluid of charged bosons at finite temperature. The approach is applicable in the weak coupling regime and the…
E. Strepparola, A. Minguzzi, M. P. TosiDec 11, 2000
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Staggered magnetization, critical behavior and weak ferromagnetic propert ies of LaMnO3 by muon spin rotation
We present a study of a microtwinned single crystal of LaMnO3 by means of implanted muons. Two muon stopping sites are identified from the symmetry of the internal field in the ordered phase. The…
M. Cestelli Guidi, G. Allodi, R. De Renzi et al.Dec 9, 2000
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Spin dynamics in nonlinear optical spectroscopy of Fermi sea systems
We discuss the role of many-body spin correlations in nonlinear optical response of a Fermi sea system with a deep impurity level. Due to the Hubbard repulsion between electrons at the impurity, the…
T. V. Shahbazyan, I. E. Perakis, M. E. RaikhDec 9, 2000
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Comment on "Hole-Burning Experiments within Glassy Models with Infinite Range Interactions"
Comment on: L.F. Cugliandolo and J.L. Iguain; Phys. Rev. Lett. 85 3448 (2000)
Gregor Diezemann, Roland BöhmerDec 8, 2000
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Influence of gauge fluctuations on fermion pairing order parameter
Using a prototype model, we study the influence of gauge fluctuations on fermion pairing order parameter which has the gauge symmetry, and demonstrate that the gauge fluctuations can destroy the long…
Yu-Liang LiuDec 8, 2000
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Efficient Total Energy Calculations from Self-Energy Models
We propose a new method for calculating total energies of systems of interacting electrons, which requires little more computational resources than standard density-functional theories. The total…
Paula Sanchez-Friera, R. W. GodbyDec 7, 2000
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Ground State of a trapped Bose-Einstein Condensate in Two Dimensions; Beyond the Mean-field Approximation
We consider the ground state of a trapped Bose-Einstein condensate in two dimensions. In the mean-field approximation, the ground state density profile satisfies the Gross-Pitaevskii equation. We…
Jens O. Andersen, Haarek HaugerudDec 7, 2000
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Stability of Attractive Bose-Einstein Condensates in a Periodic Potential
Using a standing light wave trap, a stable quasi-one-dimensional attractive dilute-gas Bose-Einstein condensate can be realized. In a mean-field approximation, this phenomenon is modeled by the cubic…
J. C. Bronski, L. D. Carr, R. Carretero-Gonzalez et al.Dec 6, 2000
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Self-Consistent Calculation of Total Energies of the Electron Gas Using Many-Body Perturbation Theory
The performance of many-body perturbation theory for calculating ground-state properties is investigated. We present fully numerical results for the electron gas in three and two dimensions in the…
P. Garcia-Gonzalez, R. W. GodbyDec 6, 2000
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Stabilization of ratchet dynamics by weak periodic signals
We study the influence of weak periodic signals on the transport properties of underdamped ratchets. We find that the constant current intervals related to the ratchet, can be significantly enlarged…
Maria Barbi, Mario SalernoDec 6, 2000
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Green's function probe of a static granular piling
We present an experiment which aim is to investigate the mechanical properties of a static granular assembly. The piling is an horizontal 3D granular layer confined in a box, we apply a localized…
Guillaume Reydellet, Eric ClémentDec 6, 2000
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The ground state properties of the spin-1/2 transverse Ising chain with periodically varying bonds and fields
Using continued fractions we study the ground state properties of the spin-1/2 Ising chain in a transverse field with periodically varying interaction strengths and external fields. We consider in…
Oleg DerzhkoDec 6, 2000
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Atomic Deuterium Adsorbed on the Surface of Liquid Helium
We investigate deuterium atoms adsorbed on the surface of liquid helium in equilibrium with a vapor of atoms of the same species. These atoms are studied by a sensitive optical method based on…
A. P. Mosk, M. W. Reynolds, T. W. HijmansDec 6, 2000
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Vortex nucleation and hysteresis phenomena in rotating Bose-Einstein condensates
We study the generation of vortices in rotating Bose--Einstein condensates, a situation which has been realized in a recent experiment (K. W. Madison, F. Chevy, W. Wohlleben, J. Dalibard, Phys. Rev.…
Juan J. Garcia-Ripoll, Victor M. Perez-GarciaDec 6, 2000
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Band-structure trend in hole-doped cuprates and correlation with Tcmax
By calculation and analysis of the bare conduction bands in a large number of hole-doped high-temperature superconductors, we have identified the energy of the so-called axial-orbital as the…
E. Pavarini, I. Dasgupta, T. Saha-Dasgupta et al.Dec 5, 2000
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Superfluid Helium 3: Link between Condensed Matter Physics and Particle Physics
The discovery of the superfluid phases of Helium 3 in 1971 opened the door to one of the most fascinating systems known in condensed matter physics. Superfluidity of Helium 3, originating from pair…
D. Vollhardt, P. WoelfleDec 5, 2000
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Correlation versus mean-field contributions to excitons, multi-excitons, and charging energies in semiconductor quantum dots
Single-dot spectroscopy is now able to resolve the energies of excitons, multi-excitons, and charging of semiconductor quantum dots with ~<1 meV resolution. We discuss the physical content of these…
J. Shumway, A. Franceschetti, Alex ZungerDec 5, 2000
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Stochastics theory of log-periodic patterns
We introduce an analytical model based on birth-death clustering processes to help understanding the empirical log-periodic corrections to power-law scaling and the finite-time singularity as…
Enrique CanessaDec 3, 2000
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Option pricing and perfect hedging on correlated stocks
We develop a theory for option pricing with perfect hedging in an inefficient market model where the underlying price variations are autocorrelated over a time tau. This is accomplished by assuming…
Josep Perello, Jaume MasoliverDec 1, 2000
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