Structural stability and energetics of single-walled carbon nanotubes under uniaxial strainA (10x10) single-walled carbon nanotube consisting of 400 atoms with 20 layers is simulated under tensile loading using our developed O(N) parallel tight-binding molecular-dynamics algorithms. It is…G. Dereli, C. Ozdogan·Mar 19, 2003SaveLearn
O(N) algorithms in tight-binding molecular-dynamics simulations of the electronic structure of carbon nanotubesThe O(N) and parallelization techniques have been successfully applied in tight-binding molecular-dynamics simulations of single-walled carbon nanotubes (SWNTs) of various chiralities. The accuracy…G. Dereli, C. Ozdogan·Mar 19, 2003SaveLearn
Time--delay autosynchronization of the spatio-temporal dynamics in resonant tunneling diodesThe double barrier resonant tunneling diode exhibits complex spatio-temporal patterns including low-dimensional chaos when operated in an active external circuit. We demonstrate how…J. Unkelbach, A. Amann, W. Just et al.·Mar 19, 2003SaveLearn
Expansion Exponents for Nonequilibrium SystemsLocal expansion exponents for nonequilibrium dynamical systems, described by partial differential equations, are introduced. These exponents show whether the system phase volume expands, contracts,…V. I. Yukalov·Mar 19, 2003SaveLearn
Quantum Conductance and Electrical ResistivityThe Landauer formula for quantum conductance, based on the modern paradigm: "conduction is transmission", is generalized to samples of macroscopic size. Two regimes of electrical conduction,…P. R. Silva, Marcos Sampaio, C. Nassif et al.·Mar 19, 2003SaveLearn
Scattering Approach to Counting Statistics in Quantum PumpsWe consider the Fermi gas in a non-equilibrium state obtained by applying an arbitrary time-dependent potential to the Fermi gas in the ground state. We present a general method that gives the…B. A. Muzykantskii, Y. Adamov·Mar 19, 2003SaveLearn
Semiclassical Quantization Rule for Bound-State Spectrum in Quantum Dots: Scattering Phase ApproximationWe study the quantum propagator in the semiclassical limit with sharp confining potentials. Including the energy-dependent scattering phase due to sharp confining potential, the modified Van…Wei Chen, Tzay-Ming Hong, Hsiu-Hau Lin·Mar 18, 2003SaveLearn
Continuous optical loading of a Bose-Einstein Condensate in the Thomas-Fermi regimeWe discuss the optical loading of a Bose-Einstein condensate in the Thomas-Fermi regime. The condensate is loaded via spontaneous emission from a reservoir of excited-state atoms. By means of a…F. Floegel, L. Santos, M. Lewenstein·Mar 18, 2003SaveLearn
Structure of surface vortex sheet between two rotating 3He superfluidsWe study a two-phase sample of superfluid 3He where vorticity exists in one phase (3He-A) but cannot penetrate across the interfacial boundary to a second coherent phase (3He-B). We calculate the…R. Hänninen, R. Blaauwgeers, V. B. Eltsov et al.·Mar 18, 2003SaveLearn
New algorithm for the computation of the partition function for the Ising model on a square latticeA new and efficient algorithm is presented for the calculation of the partition function in the S= 1 Ising model. As an example, we use the algorithm to obtain the thermal dependence of the…K. Malarz, M. S. Magdon-Maksymowicz, A. Z. Maksymowicz et al.·Mar 17, 2003SaveLearn
Anomalous Phase Transition in Strained SrTiO3 Thin FilmsWe have studied the cubic to tetragonal phase transition in epitaxial SrTiO3 films under various biaxial strain conditions using synchrotron X-ray diffraction. Measuring the superlattice peak…Feizhou He, B. O. Wells, S. M. Shapiro et al.·Mar 17, 2003SaveLearn
Universality, marginal operators, and limit cyclesThe universality of renormalization group limit cycle behavior is illustrated with a simple discrete Hamiltonian model. A non-perturbative renormalization group equation for the model is soluble…Stanislaw D. Glazek, Kenneth G. Wilson·Mar 16, 2003SaveLearn
Anomalous diffusion, Localization, Aging and Sub-aging effects in trap models at very low temperatureWe study in details the dynamics of the one dimensional symmetric trap model, via a real-space renormalization procedure which becomes exact in the limit of zero temperature. In this limit, the…Cecile Monthus·Mar 14, 2003SaveLearn
Free expansion of two-dimensional condensates with a vortexWe study the free expansion of a pancake-shaped Bose-condensed gas, which is initially trapped under harmonic confinement and containing a vortex at its centre. In the case of a radial expansion…O. Hosten, P. Vignolo, A. Minguzzi et al.·Mar 13, 2003SaveLearn
Computing the ground state solution of Bose-Einstein condensates by a normalized gradient flowIn this paper, we prove the energy diminishing of a normalized gradient flow which provides a mathematical justification of the imaginary time method used in physical literatures to compute the…Weizhu Bao, Qiang Du·Mar 13, 2003SaveLearn
Numerical Solution of the Gross-Pitaevskii Equation for Bose-Einstein CondensationWe study the numerical solution of the time-dependent Gross-Pitaevskii equation (GPE) describing a Bose-Einstein condensate (BEC) at zero or very low temperature. In preparation for the numerics we…Weizhu Bao, Dieter Jaksch, Peter A. Markowich·Mar 13, 2003SaveLearn
Josephson frequency of resonantly-coupled atomic and molecular condensatesMotivated by recent experiments [Claussen N R et al. 2003 Preprint cond-mat/0302195] we investigate the magnetic-field dependence of the Josephson frequency of coherent atom-molecule oscillations…R. A. Duine, H. T. C. Stoof·Mar 12, 2003SaveLearn
Resonant dynamics in boson-fermion mixturesThe time evolution of a dilute atomic boson-fermion mixture is studied at zero temperature, when the external magnetic field is brought close to a interspecies Feshbach resonance. On short time…M. Wouters, J. Tempere, J. T. Devreese·Mar 12, 2003SaveLearn
Ground state solution of Bose-Einstein condensate by directly minimizing the energy functionalIn this paper, we propose a new numerical method to compute the ground state solution of trapped interacting Bose-Einstein condensation (BEC) at zero or very low temperature by directly minimizing…Weizhu Bao, Weijun Tang·Mar 12, 2003SaveLearn
Screening and inplane magnetoresistance of anisotropic two-dimensional gasIn order to split the influence of the orbital and spin effects on the inplane magnetoresistance of a quasi two-dimensional gas we derive its linear response function and dielectric function for the…V. S. Khrapai·Mar 12, 2003SaveLearn
Matter-wave gap solitons in atomic bandgap structuresWe demonstrate that a Bose-Einstein condensate in an optical lattice forms a reconfigurable matter-wave structure with a band-gap spectrum, which resembles a nonlinear photonic crystal for light…Elena A. Ostrovskaya, Yuri S. Kivshar·Mar 11, 2003SaveLearn
Self-Organization in Multimode Microwave Phonon Laser (Phaser): Experimental Observation of Spin-Phonon Cooperative MotionsAn unusual nonlinear resonance was experimentally observed in a ruby phonon laser (phaser) operating at 9 GHz with an electromagnetic pumping at 23 GHz. The resonance is manifested by very slow…D. N. Makovetskii·Mar 11, 2003SaveLearn
Superfluidity in the interior-gap statesWe investigate superfluidity in the interior-gap states proposed by Liu and Wilczek. At weak coupling, we find the gapless interior-gap state unstable in physically accessible regimes of the…Shin-Tza Wu, Sungkit Yip·Mar 11, 2003SaveLearn
Rashba-effect-induced spin dephasing in n-typed InAs quantum wellsWe perform a many-body investigation of the spin dephasing in n-typed InAs quantum wells under moderate magnetic fields in the Voigt configuration by constructing and numerically solving the…M. Q. Weng, M. W. Wu·Mar 10, 2003SaveLearn
Vortex phase diagram in rotating two-component Bose-Einstein condensatesWe investigate the structure of vortex states in rotating two-component Bose-Einstein condensates with equal intracomponent but varying intercomponent coupling constants. A phase diagram in the…Kenichi Kasamatsu, Makoto Tsubota, Masahito Ueda·Mar 7, 2003SaveLearn