Motion of dark solitons in trapped Bose-Einstein condensatesWe use a multiple time scale boundary layer theory to derive the equation of motion for a dark (or `grey') soliton propagating through an effectively one-dimensional cloud of Bose-Einstein…Th. Busch, J. R. Anglin·Jan 25, 2000SaveLearn
Models for Free Granular SurfacesWe introduce two sets of continuum equations to describe granular flow on a free surface and study their properties. The equations derived from a microscopic picture that includes jumps and a…R. Mulet, H. Herrmann·Jan 25, 2000SaveLearn
Polymerized Membranes, a ReviewMembranes are of great technological and biological as well as theoretical interest. Two main classes of membranes can be distinguished: Fluid membranes and polymerized, tethered membranes. Here, we…Kay Joerg Wiese·Jan 24, 2000SaveLearn
Structure and rheology of binary mixtures in shear flowResults are presented for the phase separation process of a binary mixture subject to an uniform shear flow quenched from a disordered to a homogeneous ordered phase. The kinetics of the process is…F. Corberi, G. Gonnella, A. Lamura·Jan 24, 2000SaveLearn
Dynamics of aeolian sand ripplesWe analyze theoretically the dynamics of aeolian sand ripples. In order to put the study in the context we first review existing models. We argue on the local character of sand ripple formation.…Z. Csahok, C. Misbah, F. Rioual et al.·Jan 24, 2000SaveLearn
The interacting system of electrons, positrons and photons in high external electric and arbitrary magnetic fieldsThe connected system of Boltzman equations for the interacting system of electrons, positrons and photons in high external electric E and arbitrary magnetic H fields is solved. The consideration is…Tofig M. Gassym·Jan 24, 2000SaveLearn
Theory of Diluted Magnetic Semiconductor FerromagnetismWe present a theory of carrier-induced ferromagnetism in diluted magnetic semiconductors (III1-x Mnx V) which allows for arbitrary itinerant-carrier spin polarization and dynamic correlations.…Jürgen König, Hsiu-Hau Lin, Allan H. MacDonald·Jan 21, 2000SaveLearn
Improved Theory of Single-Particle Properties Using Sea-bosonsIn this article, we combine the ideas introduced by us earlier in various proportions to arrive at a simple and yet powerful means of studying single-particle properties of homogeneous Fermi systems…Girish S. Setlur·Jan 21, 2000SaveLearn
On the Possibility of Abnormally Intense Radiation Due to the Rotation of Electron Around a Dielectric SphereThe abnormally intense radiation due to the uniform rotation of electron around the equatorial plane of a dielectric sphere is obtained. It takes place when the sphere surface is at a specific…L. Sh. Grigoryan, H. F. Khachatryan, S. R. Arzumanyan·Jan 21, 2000SaveLearn
Thermodynamics of the spin-flop transition in a quantum XYZ chainA special limit of an antiferromagnetic XYZ chain was recently shown to exhibit interesting bulk as well as surface spin-flop transitions at T=0. Here we provide a complete calculation of the…X. Wang, X. Zotos, J. Karadamoglou et al.·Jan 21, 2000SaveLearn
Decoherence in Bose-Einstein Condensates: towards Bigger and Better Schroedinger CatsWe consider a quantum superposition of Bose-Einstein condensates in two immiscible internal states. A decoherence rate for the resulting Schroedinger cat is calculated and shown to be a significant…Diego A. R. Dalvit, Jacek Dziarmaga, Wojciech H. Zurek·Jan 20, 2000SaveLearn
Lattice model for kinetics and grain size distribution in crystallizationWe propose a simple, versatile and fast computational model tounderstand the deviations from the well-known Kolmogorov-Johnson-Mehl-Avrami kinetic theoryfound in metal recrystallization and amorphous…Mario Castro, Angel Sánchez, Francisco Domínguez-Adame·Jan 20, 2000SaveLearn
Pinning of quantized vortices in helium drop by dopant atoms and moleculesUsing a density functional method, we investigate the properties of liquid 4He droplets doped with atoms (Ne and Xe) and molecules (SF6 and HCN). We consider the case of droplets having a quantized…Franco Dalfovo, Ricardo Mayol, Marti Pi et al.·Jan 20, 2000SaveLearn
A First Principles Study Of Cu ClustersIn this communication we study the equilibrium shapes and energetics of Cu clusters of various sizes upto 20 atoms using the Full-Potential Tight Binding Muffin-tin Orbitals Molecular Dynamics. We…Aninda Jiban Bhattacharyya, Abhijit Mookerjee, A. K. Bhattacharyya·Jan 20, 2000SaveLearn
dx2-y2 pairing of composite excitations in the 2D Hubbard modelWe report on a strong coupling approach (on-site Coulomb repulsion, U larger than the nearest-neighbour hopping energy |t|) to the Hubbard model. Starting from the Hubbard operators which diagonalize…Tudor D. Stanescu, Ivar Martin, Philip Phillips·Jan 19, 2000SaveLearn
Many-body Correlation Effects in the Ultrafast Nonlinear Optical Response of Confined Fermi SeasThe dynamics of electrons and atoms interacting with intense and ultrashort optical pulses presents an important problem in physics that cuts across different materials such as semiconductors and…I. E. Perakis, T. V. Shahbazyan·Jan 19, 2000SaveLearn
The Onset of Phase Transitions in Condensed Matter and Relativistic QFTKibble and Zurek have provided a unifying causal picture for the appearance of topological defects like cosmic strings or vortices at the onset of phase transitions in relativistic QFT and condensed…R. J. Rivers, E. Kavoussanaki, G. Karra·Jan 19, 2000SaveLearn
Higher Order Effects in the Dielectric Constant of Percolative Metal-Insulator Systems above the Critical PointThe dielectric constant of a conductor-insulator mixture shows a pronounced maximum above the critical volume concentration. Further experimental evidence is presented as well as a theoretical…W. D. Heiss, D. S. McLachlan, C. Chiteme·Jan 19, 2000SaveLearn
Friedel Oscillations and Charge-density Waves Pinning in Quasi-one-dimensional Conductors: An X-ray AccessWe present an x-ray diffraction study of the Vanadium-doped blue bronze K0.3(Mo0.972V0.028)O3. At low temperature, we have observed both an intensity asymmetry of the +-2kF satellite reflections…S. Rouziere, S. Ravy, J. -P. Pouget et al.·Jan 13, 2000SaveLearn
An Exact Monte Carlo Method for Continuum Fermion SystemsWe offer a new proposal for the Monte Carlo treatment of many-fermion systems in continuous space. It is based upon Diffusion Monte Carlo with significant modifications: correlated pairs of random…M. H. Kalos, Francesco Pederiva·Jan 13, 2000SaveLearn
Comment on "Observation of Spin Injection at a Ferromagnet-Semiconductor Interface, by P.R. Hammar et alIn a recent Letter Hammar et al. claim the observation of injection of a spin-polarized current in a two-dimensional electron gas (2DEG). This is an important observation, since, despite considerable…B. J. van Wees·Jan 13, 2000SaveLearn
Universality classes of driven lattice gasesMotivated by some recent criticisms to our alternative Langevin equation for driven lattice gases (DLG) under an infinitely large driving field, we revisit the derivation of such an equation, and…P. L. Garrido, Miguel A. Muñoz, F. de los Santos·Jan 12, 2000SaveLearn
Analytical Estimate of the Critical Velocity for Vortex Pair Creation in Trapped Bose CondensatesWe use a modified Thomas-Fermi approximation to estimate analytically the critical velocity for the formation of vortices in harmonically trapped BEC. We compare this analytical estimate to numerical…M. Crescimanno, C. G. Koay, R. Peterson et al.·Jan 12, 2000SaveLearn
Generalization of k.p theory for periodic perturbationsWe extend standard k.p theory to take into account periodic perturbations which are rapidly oscillating with a wavelength of a few lattice constants. Our general formalism allows us to explicitly…R. Stubner, R. Winkler, O. Pankratov·Jan 11, 2000SaveLearn
Macroscopic Quantum Phase Interference in Antiferromagnetic ParticlesThe tunnel splitting in biaxial antiferromagnetic particles is studied with a magnetic field applied along the hard anisotropy axis. We observe the oscillation of tunnel splitting as a function of…Yi-Hang Nie, Yan-Hong Jin, J. -Q. Liang et al.·Jan 11, 2000SaveLearn