Knots in Condensed MattersWe propose two types of topologically stable knot solitons in condensed matters, one in two-component Bose-Einstein condensates and one in two-gap superconductors. We identify the knot in…Y. M. Cho·Jul 19, 2006SaveLearn
Bouchaud's model exhibits two different aging regimes in dimension oneLet Ei be a collection of i.i.d. exponential random variables. Bouchaud's model on Z is a Markov chain X(t) whose transition rates are given by wij=ν(-β((1-a)Ei-aEj)) if i, j are…Gerard Ben Arous, Jiri Cerny·May 20, 2005SaveLearn
Periodic diffraction patterns for 1D quasicrystalsA simple model of 1D structure based on a Fibonacci sequence with variable atomic spacings is proposed. The model allows for observation of the continuous transition between periodic and non-periodic…Pawel Buczek, Lorenzo Sadun, Janusz Wolny·Jan 27, 2005SaveLearn
Adiabatic association of ultracold molecules via magnetic field tunable interactionsWe consider in detail the situation of applying a time dependent external magnetic field to a 87Rb atomic Bose-Einstein condensate held in a harmonic trap, in order to adiabatically sweep the…Krzysztof Goral, Thorsten Koehler, Simon A. Gardiner et al.·Aug 17, 2004SaveLearn
High-Temperature Atomic Superfluidity in Lattice Boson-Fermion MixturesWe consider atomic Bose-Fermi mixtures in optical lattices and study the superfluidity of fermionic atoms due to s-wave pairing induced by boson-fermion interactions. We prove that the induced…F. Illuminati, A. Albus·Jun 9, 2004SaveLearn
Constructive Methods of Invariant Manifolds for Kinetic ProblemsWe present the Constructive Methods of Invariant Manifolds for model reduction in physical and chemical kinetics, developed during last two decades. The problem of reduced description is studied as a…A. N. Gorban, I. V. Karlin, A. Yu. Zinovyev·Apr 13, 2004SaveLearn
Dynamics of correlations in atomic Bose-Einstein condensatesThe Gross-Pitaevskii equation has been extremely successful in the theory of weakly-interacting Bose-Einstein condensates. However, present-day experiments reach beyond the regime of its validity due…Krzysztof Goral, Thorsten Koehler, Thomas Gasenzer et al.·Apr 6, 2004SaveLearn
Uniqueness of thermodynamic projector and kinetic basis of molecular individualismThree results are presented: First, we solve the problem of persistence of dissipation for reduction of kinetic models. Kinetic equations with thermodynamic Lyapunov functions are studied. Uniqueness…A. N. Gorban, I. V. Karlin·Apr 5, 2004SaveLearn
Quantum-magneto oscillations in a supramolecular Mn(II)-[3 x 3] gridThe magnetic grid molecule Mn(II)-[3 x 3] has been studied by high-field torque magnetometry at 3He temperatures. At fields above 5 T, the torque vs. field curves exhibit an unprecedented oscillatory…O. Waldmann, S. Carretta, P. Santini et al.·Jan 16, 2004SaveLearn
Ultrafast Conductivity Dynamics in Pentacene Probed using Terahertz SpectroscopyWe present measurements of the transient photoconductivity in pentacene single crystals using optical-pump THz-probe spectroscopy. We have measured the temperature and fluence dependence of the…V. K. Thorsmolle, R. D. Averitt, X. Chi et al.·Jan 16, 2004SaveLearn
Ferromagnetism in Fe-doped SnO2 thin filmsThin films grown by pulsed-laser deposition from targets of Sn0.95Fe0.05O2 are transparent ferromagnets with Curie temperature and spontaneous magnetization of 610 K and 2.2 Am2kg-1, respectively.…J. M. D. Coey, A. P. Douvalis, C. B. Fitzgerald et al.·Jan 16, 2004SaveLearn
Phases of a rotating Bose-Einstein condensate with anharmonic confinementWe examine an effectively repulsive Bose-Einstein condensate of atoms that rotates in a quadratic-plus-quartic potential. With use of a variational method we identify the three possible phases of the…A. D. Jackson, G. M. Kavoulakis, E. Lundh·Jan 16, 2004SaveLearn
Observation of narrow fluorescence from doubly driven four-level atoms at room temperatureUnusually narrow fluorescence peaks are seen from Rubidium-85 atoms under the action of two driving laser fields that are in a three dimensional molasses configuration. One of the lasers is held at a…Uday Kumar Khan, Jimmy Sebastian, N. Kamaraju et al.·Jan 16, 2004SaveLearn
Fluorescence from doubly driven four-level atoms - A density matrix approachThe unusually narrow features in the fluorescence from Rubidium-85 driven by cooling and repumper laser fields, reported in an earlier experiment [1] are explained on the basis of a four-level…Andal Narayanan, R. Srinivasan, Ashok Vudayagiri et al.·Jan 16, 2004SaveLearn
A first principles simulation of rigid waterWe present the results of Car-Parrinello (CP) simulations of water at ambient conditions and under pressure, using a rigid molecule approximation. Throughout our calculations, water molecules were…M. Allesch, E. Schwegler, F. Gygi et al.·Jan 15, 2004SaveLearn
Origin of asymmetric reversal modes in ferromagnetic/antiferromagnetic multilayersExperimentally an asymmetry of the reversal modes has been found in certain exchange bias systems. From a numerical investigation of the domain state model evidence is gained that this effect depends…B. Beckmann, U. Nowak, K. D. Usadel·Jan 14, 2004SaveLearn
Imaging of spinor gasesWe explore the dielectric properties of spinor condensates. Gases with vector (nematic) order, such as spin-1 condensates with ferromagnetic (antiferromagnetic) interactions, display optical activity…Iacopo Carusotto, Erich J. Mueller·Jan 14, 2004SaveLearn
Vortex waves and the onset of turbulence in 3He-BIn a recent experiment Finne et al. discovered an intrinsic condition for the onset of quantum turbulence in 3He-B, that q=alpha/(1-alpha')<1, where alpha and alpha' are mutual friction…K. L. Henderson, C. F. Barenghi·Jan 13, 2004SaveLearn
Testing Option Pricing with the Edgeworth ExpansionThere is a well developed framework, the Black-Scholes theory, for the pricing of contracts based on the future prices of certain assets, called options. This theory assumes that the probability…Ruy Gabriel Balieiro Filho, Rogerio Rosenfeld·Jan 12, 2004SaveLearn
Dynamical mechanism of anticipating synchronization in excitable systemsWe analyze the phenomenon of anticipating synchronization of two excitable systems with unidirectional delayed coupling which are subject to the same external forcing. We demonstrate for different…Marzena Ciszak, Francesco Marino, Raul Toral et al.·Jan 12, 2004SaveLearn
Spin Transport in Two Dimensional Hopping SystemsA two dimensional hopping system with Rashba spin-orbit interaction is considered. Our main interest is concerned with the evolution of the spin degree of freedom of the electrons. We derive the rate…T. Damker, H. Boettger, V. V. Bryksin·Jan 12, 2004SaveLearn
Linear and nonlinear dynamics of matter wave packets in periodic potentialsWe investigate experimentally and theoretically the nonlinear propagation of 87Rb Bose Einstein condensates in a trap with cylindrical symmetry. An additional weak periodic potential which encloses…Th. Anker, M. Albiez, B. Eiermann et al.·Jan 10, 2004SaveLearn
Langevin equation with scale-dependent noiseA new wavelet based technique for the perturbative solution of the Langevin equation is proposed. It is shown that for the random force acting in a limited band of scales the proposed method directly…M. V. Altaisky·Jan 10, 2004SaveLearn
Wave turbulence and Bose-Einstein condensatesAsymptotic behavior of a class of nonlinear Schrödinger equations are studied. Particular cases of 1D weakly focusing and Bose-Einstein condensates are considered. A statistical approach is presented…Christophe Josserand·Jan 9, 2004SaveLearn
EMS Measurement of the Valence Spectral Function of Silicon - a test of Many-body TheoryThe spectral function A(q,omega) of silicon has been measured along a number of symmetry directions using high-energy high-resolution electron momentum spectroscopy. It is compared with…C. Bowles, A. S. Kheifets, V. A. Sashin et al.·Jan 8, 2004SaveLearn