Critical Properties in Dynamical Charge Correlation Function for the One-Dimensional Mott InsulatorCritical properties in the dynamical charge correlation function for the one-dimensional Mott insulator are studied. By properly taking into account the final-state interaction between the…T. Fujii, N. Kawakami·Jul 12, 1999SaveLearn
A quasi-unit cell model for Al-Ni-Co Ideal Quasicrystal based on clusters with broken 10-fold symmetryWe present new evidence supporting the quasi-unit cell description of the Al72Ni20Co8 decagonal quasicrystal which shows that the solid is composed of repeating, overlapping decagonal…E. Abe, K. Saitoh, H. Takakura et al.·Jul 11, 1999SaveLearn
Collimation Mechanism for Atom LasersA mechanism is suggested for creating well-collimated beams of neutral spin-polarized particles by means of magnetic fields. This mechanism can be used in atom lasers for the formation of directed…V. I. Yukalov, E. P. Yukalova·Jul 11, 1999SaveLearn
Localized magnetoplasmon modes arising from broken translational symmetry in semiconductor superlatticesThe electromagnetic propagator associated with the localized collective magnetoplasmon excitations in a semiconductor superlattice with broken translational symmetry, is calculated analytically…J. H. Reina, J. C. Granada, N. F. Johnson·Jul 9, 1999SaveLearn
Simple model with facilitated dynamics for granular compactionA simple lattice model is used to study compaction in granular media. As in real experiments, we consider a series of taps separated by large enough waiting times. The relaxation of the density…J. Javier Brey, A. Prados, B. Sanchez-Rey·Jul 9, 1999SaveLearn
Nonperturbative XY-model approach to strong coupling superconductivity in two and three dimensionsFor an electron gas with delta-function attraction we investigate the crossover from weak- to strong-coupling supercoductivity in two and three dimensions. We derive analytic expressions for the…E. Babaev, H. Kleinert·Jul 9, 1999SaveLearn
Oscillatory Tunnel Splittings in Spin Systems: A Discrete Wentzel-Kramers-Brillouin ApproachCertain spin Hamiltonians that give rise to tunnel splittings that are viewed in terms of interfering instanton trajectories, are restudied using a discrete WKB method, that is more elementary, and…Anupam Garg·Jul 9, 1999SaveLearn
Fluctuation Conductivity in Insulator-Superconductor Transitions with DissipationWe analyze here the fluctuation conductivity in the vicinity of the critical point in a 2D Josephson junction array shunted by an Ohmic resistor.We find that at the Gaussian level, the conductivity…Denis Dalidovich, Philip Phillips·Jul 8, 1999SaveLearn
High-Tc Superconductors in Applied Magnetic Fields Parallel to the CuO Planes: First Order Transition with Slow Onset of ResistivityThe three dimensional uniformly frustrated XY model is used as a model of a high temperature superconductor in an applied magnetic field parallel to the CuO-planes. Through Monte Carlo simulations…Peter Olsson, Petter Holme·Jul 8, 1999SaveLearn
Electronic structure without exchange?The correlation holes for densities of equal and opposite spin around a test electron are determined from the Schrödinger equation with proper boundary conditions. The traditional "exchange"…T. Jarlborg·Jul 7, 1999SaveLearn
Free expansion of Bose-Einstein condensates with quantized vorticesThe expansion of Bose-Einstein condensates with quantized vortices is studied by solving numerically the time-dependent Gross-Pitaevskii equation at zero temperature. For a condensate initially…Franco Dalfovo, Michele Modugno·Jul 7, 1999SaveLearn
Operation characteristics of piezoelectric quartz tuning forks in high magnetic fields at liquid helium temperaturesPiezoelectric quartz tuning forks are investigated in view of their use as force sensors in dynamic mode scanning probe microscopy at temperatures down to 1.5 K and in magnetic fields up to 8 T. The…J. Rychen, T. Ihn, P. Studerus et al.·Jul 6, 1999SaveLearn
The Wess-Zumino term and quantum tunnelingThe significance of the Wess--Zumino term in spin tunneling is explored, and a formula is established for the splitting of energy levels of a particle with large fermionic spin as an applied magnetic…J. - Q. Liang, L. Maharana, H. J. W. Mueller-Kirsten·Jul 6, 1999SaveLearn
Umklapp scattering in transport through a 1D wire of finite lengthSuppression of electron current ΔI through a 1D channel of length L connecting two Fermi liquid reservoirs is studied taking into account the Umklapp interaction induced by a periodic potential.…Vadim Ponomarenko·Jul 5, 1999SaveLearn
Multi-scale Correlation Functions in Strong TurbulenceUnder the framework of V. Yakhot [Phys.Rev.E, 57, 1737 (1998)] modelling of intermittent structure functions in fully developed turbulence and based on the experimentally supported Markovian…Jahanshah Davoudi, M. Reza Rahimi Tabar·Jul 5, 1999SaveLearn
Developing the MTO FormalismWe review the simple linear muffin-tin orbital method in the atomic-spheres approximation and a tight-binding representation (TB-LMTO-ASA method), and show how it can be generalized to an accurate…O. K. Andersen, T. Saha-Dasgupta, R. W. Tank et al.·Jul 5, 1999SaveLearn
Theoretical Model for the Kramers-Moyal Description of Turbulence CascadesWe derive the Kramers-Moyal equation for the conditional probability density of velocity increments from the theoretical model recently proposed by V.Yakhot [Phys.Rev.E 57, 1737 (1998)] in the…Jahanshah Davoudi, M. Reza Rahimi Tabar·Jul 5, 1999SaveLearn
Two-Dimensional Gross-Pitaevskii Equation: Theory of Bose-Einstein Condensation and the Vortex StateWe derive the Gross-Pitaevskii equation in two-dimension from the first principles of two-dimensional scattering theory. Numerical calculation of the condensate wave function shows that atoms in a…Sang-Hoon Kim, Changyeon Won, Sung Dahm Oh et al.·Jul 5, 1999SaveLearn
Generalized Random Phase Approximation: Zero and Non-Zero Temperature Properties of an Interacting Electron GasCorrelated systems at both zero and nonzero temperature are treated here from a novel angle using a functional method. This functional method is an extension of the usual effective potential method.…A. Rebei, W. N. G. Hitchon·Jul 2, 1999SaveLearn
The steady state quantum statistics of a non-Markovian atom laserWe present a fully quantum mechanical treatment of a single-mode atomic cavity with a pumping mechanism and an output coupling to a continuum of external modes. This system is a schematic description…J. J. Hope, G. M. Moy, M. J. Collett et al.·Jul 2, 1999SaveLearn
Transmission Through Carbon Nanotubes With Polyhedral CapsWe study electron transport between capped carbon nanotubes and a substrate, and relate the transmission probability to the local density of states in the cap. Our results show that the transmission…M. P. Anantram, T. R. Govindan·Jul 1, 1999SaveLearn
Static Properties of Trapped Bose-Fermi Mixed Condensate of Alkali AtomsStatic properties of a bose-fermi mixture of trapped potassium atoms are studied in terms of coupled Gross-Pitaevskii and Thomas-Fermi equations for both repulsive and attractive bose-fermi…T. Miyakawa, K. Oda, T. Suzuki et al.·Jul 1, 1999SaveLearn
Finite temperature transport in integrable quantum many body systemsRecent developments in the analysis of finite temperature dissipationless transport in integrable quantum many body problems are presented. In particular, we will discuss: (i) the role played by the…X. Zotos, F. Naef, P. Prelovsek·Jun 30, 1999SaveLearn
The validity of the Landau-Zener model for output coupling of Bose condensatesWe investigate the validity of the Landau-Zener model in describing the output coupling of Bose condensates from magnetic traps by a chirped radiofrequency field. The predictions of the model are…J. -P. Martikainen, K. -A. Suominen·Jun 28, 1999SaveLearn
Magnetoresistance of magnetic multilayers in the CPP mode:evidence for non-local scatteringWe have carried out measurements of the magnetoresistance MR(H) in the CPP (Current Perpendicular to the Plane) mode for two types of magnetic multilayers which have different layer ordering. The…Didier Bozec, M. A. Howson, B. J. Hickey et al.·Jun 28, 1999SaveLearn