Skip to content

Condensed Matter papers — page 125

cond-matBrowse archive

Induced instability for boson-fermion mixed condensate of Alkali atoms due to attractive boson-fermion interaction
Instabilities for boson-fermion mixed condensates of trapped Alkali atoms due to the boson-fermion attractive interaction are studied using a variational method. Three regions are shown for their…
T. Miyakawa, T. Suzuki, H. YabuFeb 3, 2000
Learn
Temperature dependent changes of the Mn 3d and 4p bands near Tc in Colossal Magnetoresistance systems: a XANES study of La1-xCaxMnO3
We report high-resolution X-ray Absorption Near Edge Structure (XANES) measurements at the Mn K-edge as a function of temperature, for La1-xCaxMnO3 samples, with a focus mainly on the…
F. Bridges, C. H. Booth, G. H. Kwei et al.Feb 3, 2000
Learn
Analytic properties of the structure function for the one-dimensional one-component log-gas
The structure function S(k;β) for the one-dimensional one-component log-gas is the Fourier transform of the charge-charge, or equivalently the density-density, correlation function. We show that…
P. J. Forrester, B. Jancovici, D. S. McAnallyFeb 3, 2000
Learn
Evaluation of the quantitative prediction of a trend reversal on the Japanese stock market in 1999
In January 1999, the authors published a quantitative prediction that the Nikkei index should recover from its 14 year low in January 1999 and reach ≈ 20500 a year later. The purpose of the…
Anders Johansen, Didier SornetteFeb 3, 2000
Learn
Quantum Critical Dynamics of the Skyrmion Lattice
Near to filling fraction ν=1, the quantum Hall ferromagnet contains multiple Skyrmion spin excitations. This multi-Skyrmion system has a tremendously rich quantum-critical structure. This is…
A. G. GreenFeb 3, 2000
Learn
Self-Duality in Superconductor-Insulator Quantum Phase Transitions
It is argued that close to a Coulomb interacting quantum critical point, the interaction between two vortices in a disordered superconducting thin film separated by a distance r changes from…
Adriaan M. J. SchakelFeb 2, 2000
Learn
Disorder Induced Transitions in Layered Coulomb Gases and Superconductors
A 3D layered system of charges with logarithmic interaction parallel to the layers and random dipoles is studied via a novel variational method and an energy rationale which reproduce the known phase…
Baruch Horovitz, Pierre Le DoussalFeb 2, 2000
Learn
Onset of sliding friction in incommensurate systems
We study the dynamics of an incommensurate chain sliding on a periodic lattice, modeled by the Frenkel Kontorova hamiltonian with initial kinetic energy, without damping and driving terms. We show…
L. Consoli, H. J. F. Knops, A. FasolinoFeb 1, 2000
Learn
The effect of the annealing temperature on the local distortion of La0.67Ca0.33MnO3 thin films
Mn K-edge fluorescence data are presented for thin film samples (3000~Å) of Colossal Magnetoresistive (CMR) La0.67Ca0.33MnO3: as-deposited, and post-annealed at 1000 K and 1200 K. The…
D. Cao, F. Bridges, D. Worledge et al.Feb 1, 2000
Learn
Adsorption of benzene on Si(100) from first principles
Adsorption of benzene on the Si(100) surface is studied from first principles. We find that the most stable configuration is a tetra-σ-bonded structure characterized by one C-C double bond and four…
Pier Luigi Silvestrelli, Francesco Ancilotto, Flavio ToigoFeb 1, 2000
Learn
Iterative algorithm versus analytic solutions of the parametrically driven dissipative quantum harmonic oscillator
We consider the Brownian motion of a quantum mechanical particle in a one-dimensional parabolic potential with periodically modulated curvature under the influence of a thermal heat bath. Analytic…
Michael Thorwart, Peter Reimann, Peter HänggiJan 31, 2000
Learn
Ising Model and L - Function
The correlation functions are calculated for the two dimensional Ising model with free boundary conditions and the two dimensional Ising model with periodic boundary conditions.
Yu. M. ZinovievJan 31, 2000
Learn
Self-Similar Crossover in Statistical Physics
An analytical method is advanced for constructing interpolation formulae for complicated problems of statistical mechanics, in which just a few terms of asymptotic expansions are available. The…
V. I. Yukalov, S. GluzmanJan 31, 2000
Learn
Auger decay, Spin-exchange, and their connection to Bose-Einstein condensation of excitons in Cu2O
In view of the recent experiments of O'Hara, et al. on excitons in Cu2O, we examine the interconversion between the angular-momentum triplet-state excitons and the angular-momentum singlet-state…
G. M. Kavoulakis, A. MysyrowiczJan 31, 2000
Learn
Strong compensation of the quantum fluctuation corrections in clean superconductor
The theory of fluctuation conductivity for an arbitrary impurity concentration including ultra-clean limit is developed. It is demonstrated that the formal divergency of the fluctuation density of…
D. V. Livanov, G. Savona, A. A. VarlamovJan 30, 2000
Learn
Tractable non-local correlation density functionals for flat surfaces and slabs
A systematic approach for the construction of a density functional for van der Waals interactions that also accounts for saturation effects is described, i.e. one that is applicable at short…
Henrik Rydberg, Bengt I. Lundqvist, David C. Langreth et al.Jan 29, 2000
Learn
Spinless fermions and charged stripes at the strong-coupling limit
Spinless fermions on a lattice with nearest-neighbor repulsion serve as a toy version Hubbard model, and have a symmetry-broken even/odd superlattice at half-filling. At infinite repulsion, doped…
C. L. Henley, N. G. ZhangJan 28, 2000
Learn
Phase Diagram of a Classical Fluid in a Quenched Random Potential
We consider the phase diagram of a classical fluid in the presence of a random pinning potential of arbitrary strength. Introducing replicas for averaging over the quenched disorder, we use the…
Fabrice Thalmann, Chandan Dasgupta, Denis FeinbergJan 28, 2000
Learn
Evolution of reference networks with aging
We study the growth of a reference network with aging of sites defined in the following way. Each new site of the network is connected to some old site with probability proportional (i) to the…
S. N. Dorogovtsev, J. F. F. MendesJan 28, 2000
Learn
Learning structured data from unspecific reinforcement
We show that a straightforward extension of a simple learning model based on the Hebb rule, the previously introduced Association-Reinforcement-Hebb-Rule, can cope with "delayed", unspecific…
M. Biehl, R. Kuehn, I. -O. StamatescuJan 27, 2000
Learn
s+d pairing in orthorhombic phase of copper-oxides
A microscopical theory of electronic spectrum and superconductivity is formulated within the two-dimensional anisotropic t-J model with tx≠ ty and Jx≠ Jy. Renormalization of…
N. M. Plakida, V. S. OudovenkoJan 27, 2000
Learn
Far-infrared excitations in a quantum antidot at finite magnetic fields
We have investigated the far-infrared dipole modes of a quantum antidot submitted to a perpendicularly applied magnetic field B. The ground state of the antidot is described within local spin-density…
A. Emperador, M. Pi, M. Barranco et al.Jan 26, 2000
Learn
Time correlations of a laser-induced Bose-Einstein condensate
We analyze the multi-time correlations of a laser-induced Bose-Einstein condensate. We use quantum stochastic methods to obtain under certain circumstances a Fokker-Planck equation which describes…
T. Felbinger, L. Santos, M. Wilkens et al.Jan 26, 2000
Learn
Surface collective excitations in ultrafast pump-probe spectroscopy of metal nanoparticles
The role of surface collective excitations in the electron relaxation in small metal particles is studied. It is shown that the dynamically screened electron-electron interaction in a nanoparticle…
T. V. Shahbazyan, I. E. PerakisJan 25, 2000
Learn
The jamming transition of Granular Media
We briefly review the basics ideas and results of a recently proposed statistical mechanical approach to granular materials. Using lattice models from standard Statistical Mechanics and results from…
Antonio Coniglio, Mario NicodemiJan 25, 2000
Learn
← PreviousPage 125Next →