Skip to content

Condensed Matter papers — page 86

cond-matBrowse archive

Theoretical investigation of one-dimensional cavities in two-dimensional photonic crystals
We study numerically the features of the resonant peak of one-dimensional (1-D) dielectric cavities in a two-dimensional (2-D) hexagonal lattice. We use both the transfer matrix method and the finite…
S. Foteinopoulou, C. M. SoukoulisJun 1, 2001
Learn
Vortices in superfluid trapped Fermi gases at zero temperature
We discuss various aspects of the vortex state of a dilute superfluid atomic Fermi gas at T=0. The energy of the vortex in a trapped gas is calculated and we provide an expression for the…
G. M. Bruun, L. ViveritJun 1, 2001
Learn
Hydrodynamic Excitations in a Spin-Polarized Fermi Gas under Harmonic Confinement in One Dimension
We consider a time-dependent non-linear Schrödinger equation in one dimension (1D) with a fifth-order interaction term and external harmonic confinement, as a model for both (i) a Bose gas with…
A. Minguzzi, P. Vignolo, M. L. Chiofalo et al.Jun 1, 2001
Learn
Light scattering from disordered overlayers of metallic nanoparticles
We develop a theory for light scattering from a disordered layer of metal nanoparticles resting on a sample. Averaging over different disorder realizations is done by a coherent potential…
Peter JohanssonMay 31, 2001
Learn
Are EUR and GBP different words for the same currency ?
The British Pound (GBP) is not part of the Euro (EUR) monetary system. In order to find out arguments on whether GBP should join the EUR or not correlations are calculated between GBP and EUR,…
M. Ausloos, K. IvanovaMay 31, 2001
Learn
Anomalous Hall effect and weak localization corrections in a ferromagnet
In this paper, we report results on the anomalous Hall effect. First, we summarize analytical calculations based on the Kubo formalism : explicit expressions for both skew-scattering and side-jump…
A. Crépieux, J. Wunderlich, V. K. Dugaev et al.May 31, 2001
Learn
The Happer's puzzle degeneracies and Yangian
We find operators distinguishing the degenerate states for the Hamiltonian H= x(K+1/2)Sz + K· S at x= 1 that was given by Happer et al[1,2] to interpret the curious…
Cheng-Ming Bai, Mo-lin Ge, Kang XueMay 31, 2001
Learn
Nonlocal electrodynamics of two-dimensional wire mesh photonic crystals
We calculate analytically the spectra of plasma waves and electromagnetic waves (EMW) in metallic photonic crystal consisting of the parallel thin infinite metallic cylinders embedded in the…
A. L. Pokrovsky, A. L. EfrosMay 31, 2001
Learn
Localized breathing solutions for Bose-Einstein condensates in periodic traps
We demonstrate the existence of localized oscillatory breathers for quasi-one-dimensional Bose-Einstein condensates confined in periodic potentials. The breathing behavior corresponds to…
R. Carretero-González, K. PromislowMay 30, 2001
Learn
Optical spectroscopy of single quantum dots at tunable positive, neutral and negative charge states
We report on the observation of photoluminescence from positive, neutral and negative charge states of single semiconductor quantum dots. For this purpose we designed a structure enabling optical…
D. V. Regelman, E. Dekel, D. Gershoni et al.May 30, 2001
Learn
Low-temperature transport in Heisenberg chains
A technique to determine accurately transport properties of integrable and non-integrable quantum-spin chains at finite temperatures by Quantum Monte-Carlo is presented. The reduction of the Drude…
J. V. Alvarez, Claudius GrosMay 30, 2001
Learn
Interface depinning versus absorbing-state phase transitions
According to recent numerical results from lattice models, the critical exponents of systems with many absorbing states and an order parameter coupled to a non-diffusive conserved field coincide with…
Mikko Alava, Miguel A. MunozMay 30, 2001
Learn
Ising thin films with modulations and surface defects
Properties of magnetic films are studied in the framework of Ising models. In particular, we discuss critical phenomena of ferromagnetic Ising films with straight lines of magnetic adatoms and…
W. Selke, M. Pleimling, I. Peschel et al.May 30, 2001
Learn
Quantum nature of dislocations in pure bcc Helium
Recent experiments show the thermal growth of dislocation lines in unlta-pure bcc 3He. The activation energy for the growth of the dislocation lines is found to agree with the activation energy…
Nir GovMay 29, 2001
Learn
On the Statistical Analysis of Single Vortex Nucleation Events in Superfluid He-4
We investigate the statistical properties of single phase slip events observed in vortex nucleation experiments in He-4 by the groups in Berkeley and Paris. From the cumulative distribution function…
M. Niemetz, W. SchoepeMay 29, 2001
Learn
New phasing method based on the principle of minimum charge
A new method of the phase determination in X-ray crystallography is proposed. The method is based on the so-called "minimum charge" principle, recently suggested by Elser. The electron…
P. KaluginMay 29, 2001
Learn
Screening ineffectiveness and THz emission at bare LO phonon frequencies
Within a hydrodynamic approach we investigate the dynamics of an inhomogeneous electron-hole gas coupled to phonons in Te and the corresponding THz emission. We find that the longitudinal…
F. M. Souza, J. C. EguesMay 28, 2001
Learn
The Highest-Derivative Version of Variational Perturbation Theory
We systematically investigate different versions of variational perturbation theory by forcing not only the first or second but also higher derivatives of the approximant with respect to the…
Bodo Hamprecht, Axel PelsterMay 26, 2001
Learn
Selective Transparence of Single-Mode Waveguides with Surface Scattering
A random surface scattering in a one-mode waveguide is studied in the case when the surface profile has long-range correlations along the waveguide. Analytical treatment of this problem shows that…
F. M. Izrailev, N. M. MakarovMay 25, 2001
Learn
Interplay of linear and modified nonlinear impurities in the formation of stationary localized states
Formation of stationary localized states in one-dimensional chain due to a linear impurity and a modified nonlinear impurity is studied. Furthermore, a one-dimensional chain with linear and modified…
Bikash C. Gupta, Sang Bub LeeMay 25, 2001
Learn
Where the Tsallis Statistic is valid?
In the present paper are analysed the conditions for the validity of the Tsallis Statistics. The same have been done following the analogy with the traditional case: starting from the microcanonical…
L. Velazquez, F. GuzmanMay 23, 2001
Learn
Domain formation in noninstantaneous symmetry breaking phase transitions
In the framework of the Ginzburg-Landau harmonic potential approximation, we present a possible modeling of the time-dependence of the frequency of the order parameter mode suitable to account for…
E. Alfinito, G. VitielloMay 22, 2001
Learn
Competition of Branches
We consider a general model of branch competition that automatically leads to a critical branching configuration. This model is inspired by the 4-η expansion of the dielectric breakdown model…
M. B. HastingsMay 22, 2001
Learn
Quantum effects on the dynamics of a two-mode atom-molecule Bose-Einstein condensate
We study the system of coupled atomic and molecular condensates within the two-mode model and beyond mean-field theory (MFT). Large amplitude atom-molecule coherent oscillations are shown to be…
A. Vardi, V. A. Yurovsky, J. R. AnglinMay 22, 2001
Learn
Interplay between disorder and intersubband collective excitations in the two-dimensional electron gas
Intersubband absorption in modulation-doped quantum wells is usually appropriately described as a collective excitation of the confined two-dimensional electron gas. At sufficiently low electron…
Stefano Luin, Vittorio Pellegrini, Fabio Beltram et al.May 22, 2001
Learn
← PreviousPage 86Next →