Nucleation and Interfacial Coupling between Pure and Dirty Superfluid Phases of 3HeThe nucleation of the first order phase transition of superfluid 3He-B from superfluid 3He-A is quite remarkable since it requires a seed of the order of a micron. We have studied this nucleation for…G. Gervais, K. Yawata, N. Mulders et al.·Dec 14, 2001SaveLearn
Shell structure and pairing for interacting fermions in a trapThe shell structures for weakly interacting fermions in harmonic oscillator traps at zero temperature undergo several transitions depending on the number of particles in the trap and their…Henning Heiselberg, Ben Mottelson·Dec 13, 2001SaveLearn
Distribution function of electrons and phonons in semiconductors and semimetals in high electric and quantizing magnetic fieldsThe distribution function of electrons and phonons interacting with electrons in semiconductors and semimetals in high electric and quantizing magnetic fields as a result of the solution of the…T. M. Gassym·Dec 13, 2001SaveLearn
Ferromagnetism of 3He Films in the Low Field LimitWe provide evidence for a finite temperature ferromagnetic transition in 2-dimensions as H 0 in thin films of 3He on graphite, a model system for the study of two-dimensional magnetism. We…H. M. Bozler, Yuan Gu, Jinshan Zhang et al.·Dec 13, 2001SaveLearn
Uniaxial Lifshitz Point at O(εL2)The critical exponents νL2, ηL2 and γL2 of a uniaxial Lifshitz point are calculated at two-loop level using renormalization group and εL-expansion techniques. We found a new…Luiz C. de Albuquerque, Marcelo M. Leite·Dec 13, 2001SaveLearn
Surface flows of granular materials: A short introduction to some recent modelsWe present a short review of recent theoretical descriptions of flows occuring at the surface of granular piles, and focus mainly on two models: the phenomenological ``BCRE'' model and the…Achod Aradian, Elie Raphael, Pierre-Gilles de Gennes·Dec 12, 2001SaveLearn
Diluted magnetic semiconductor quantum dots: an extreme sensitivity of the hole Zeeman splitting on the aspect ratio of the confining potentialThe valence band states confined in infinitely deep quantum dots made of diluted magnetic semiconductors (DMS) are considered theoretically. A complex anisotropic structure of the valence bands in…F. V. Kyrychenko, J. Kossut·Dec 12, 2001SaveLearn
Tip Splittings and Phase Transitions in the Dielectric Breakdown Model: Mapping to the DLA ModelWe show that the fractal growth described by the dielectric breakdown model exhibits a phase transition in the multifractal spectrum of the growth measure. The transition takes place because the…Joachim Mathiesen, Mogens H. Jensen·Dec 12, 2001SaveLearn
Chaotic front dynamics in semiconductor superlatticesWe analyze the dynamical evolution of the current and the charge density in a superlattice for fixed external dc voltage in the regime of self-sustained current oscillations, using a microscopic…A. Amann, J. Schlesner, A. Wacker et al.·Dec 12, 2001SaveLearn
Existence and stability of bushes of vibrational modes for octahedral mechanical systems with Lennard-Jones potentialThe special nonlinear dynamical regimes, "bushes of normal modes", can exist in the N-particle Hamiltonian systems with discrete symmetry. The dimension of the bush can be essentially less…G. M. Chechin, A. V. Gnezdilov, M. Yu. Zekhtser·Dec 12, 2001SaveLearn
High Magnetic Field NMR Studies of LiVGe2O6, a quasi 1-D Spin S = 1 SystemWe report 7Li pulsed NMR measurements in polycrystalline and single crystal samples of the quasi one-dimensional S=1 antiferromagnet LiVGe2O6, whose AF transition temperature is…P. Vonlanthen, K. B. Tanaka, Atsushi Goto et al.·Dec 12, 2001SaveLearn
Bose-Einstein condensation of two interacting particlesWe investigate the notion of Bose-Einstein condensation of interacting particles. The definition of the condensate is based on the existence of the dominant eigenvalue of the single-particle density…M. A. Cirone, K. Goral, K. Rzazewski et al.·Dec 12, 2001SaveLearn
Gauge (non-)invariant Green functions of Dirac fermions coupled to gauge fieldsWe develop a unified approach to both infrared and ultraviolet asymptotics of the fermion Green functions in the condensed matter systems that allow for an effective description in the framework of…D. V. Khveshchenko·Dec 11, 2001SaveLearn
Theory of Electron Phenomena in Deformed CrystalsOn this article there are presented the main results of the theory of electron phenomena in an unordered condensed matter that can be described as an inhomogeneously deformed crystalline lattice with…Ilya M. Dubrovskii·Dec 11, 2001SaveLearn
Quadratic diffusion Monte Carlo and pure estimators for atomsThe implementation and reliability of a quadratic diffusion Monte Carlo method for the study of ground-state properties of atoms are discussed. We show in the simple yet non-trivial calculation of…A. Sarsa, J. Boronat, J. Casulleras·Dec 11, 2001SaveLearn
Vortices in atomic-molecular Bose-Einstein condensatesThe structure and stability of vortices in hybrid atomic-molecular Bose-Einstein condensates is analyzed in the framework of a two-component Gross-Pitaevskii-type model that describes the stimulated…Tristram J. Alexander, Yuri S. Kivshar, Elena A. Ostrovskaya et al.·Dec 11, 2001SaveLearn
Tunneling of quantum rotobreathersWe analyze the quantum properties of a system consisting of two nonlinearly coupled pendula. This non-integrable system exhibits two different symmetries: a permutational symmetry (permutation of the…J. Dorignac, S. Flach·Dec 10, 2001SaveLearn
The theory of transvers Nernst--Ettingshausen effect and thermopower of heated (hot) charge carriers in nondegenerate semiconductors in the case of high anisotropy of phonons distribution functionThe transverse Nernst--Ettingshausen effect and thermopower of hot charge carriers in nondegenerate impure semiconductors placed at high electric and nonquantized magnetic fields in the nondiffusion…T. M. Gassym, H. A. Hasanov·Dec 10, 2001SaveLearn
Cooperative and non-linear phenomena at the neutral-ionic phase transitionThe complex interplay among on-site energy, Hubbard U, and coupling to Holstein and Peierls phonons at the neutral-ionic phase transition is discussed using diagrammatic valence bond calculations.…Anna Painelli, Luca Del Freo, Zoltan G. Soos·Dec 10, 2001SaveLearn
Scattering of vortex pairs in 2D easy-plane ferromagnetsVortex-antivortex pairs in 2D easy-plane ferromagnets have characteristics of solitons in two dimensions. We investigate numerically and analytically the dynamics of such vortex pairs. In particular…A. S. Kovalev, S. Komineas, F. G. Mertens·Dec 10, 2001SaveLearn
Effect of Defects on the Line shape of Electron Paramagnetic Resonance Signals from the Single-Molecule Magnet Mn12: A Theoretical StudyWe herein estimate the effect of lattice defects on the line shape of electron paramagnetic resonance (EPR) signals from a single crystal of the S=10 single-molecule magnet Mn12 with the…Kyungwha Park, N. S. Dalal, P. A. Rikvold·Dec 9, 2001SaveLearn
Time Scales of Phonon Induced Decoherence of Semiconductor Spin QubitsDecoherence of a shallow donor electron spin in silicon caused by electron-lattice interaction is studied. We find that there are two time scales associated with the evolution of the electron spin…D. Mozyrsky, Sh. Kogan, G. P. Berman·Dec 7, 2001SaveLearn
Proton Spin Relaxation Induced by Quantum Tunneling in Fe8 Molecular NanomagnetThe spin-lattice relaxation rate T1-1 and NMR spectra of 1H in single crystal molecular magnets of Fe8 have been measured down to 15 mK. The relaxation rate T1-1 shows a strong…Miki Ueda, Satoru Maegawa, Susumu Kitagawa·Dec 7, 2001SaveLearn
Density Matrix of a Bose--Einstein Condensate: Steady--State versus Mean--Field ApproachWe compare the equilibrium solution for the condensate obtained in the mean--field approximation to the master equation for sympathetic cooling with the one obtained by Scully for a system in contact…S. J. Wang, M. C. Nemes, A. N. Salgueiro et al.·Dec 7, 2001SaveLearn
Boundary lubrication properties of materials with expansive freezingWe have performed molecular dynamics simulations of solid-solid contacts lubricated by a model fluid displaying many of the properties of water, particularly its expansive freezing. Near the region…E. A. Jagla·Dec 6, 2001SaveLearn