Investigations of a two-mode atom laser modelAtom lasers based on rf-outcoupling from a trapped Bose-Einstein condensate can be described by a set of generalized, coupled Gross-Pitaevskii equations (GPE). If not only one but two radio…Jens Schneider, Axel Schenzle·Oct 27, 1999SaveLearn
Electronic Dephasing in the Quantum Hall RegimeBy means of degenerate four-wave mixing (FWM), we investigate the quantum coherence of electron-hole pairs in the presence of a two-dimensional electron gas in modulation-doped GaAs-AlGaAs quantum…N. A. Fromer, C. Schüller, D. S. Chemla et al.·Oct 26, 1999SaveLearn
Spin fractionalization of an even number of electrons in a Quantum dotAn experiment is proposed of non perturbative tunneling in a Quantum dot connected to leads in a pillar configuration, which would shed light on the physics of the mesoscopic Kondo problem. We…Domenico Giuliano, Arturo Tagliacozzo·Oct 26, 1999SaveLearn
Interfacial Energy and Fine Defect Structures for Incoherent FilmsThis note summarizes recent results in which modern techniques of the calculus of variations are used to obtain qualitative features of film-substrate interfaces for a broad class of interfacial…Paolo Cermelli, Morton E. Gurtin, Giovanni Leoni·Oct 26, 1999SaveLearn
Theory of plastic flows of CDWs in application to the current conversionWe suggest a theoretical picture for distributions of plastic deformations experienced by a sliding Charge Density Wave in the course of the conversion from the normal current at the contact to the…S. Brazovski, N. Kirova·Oct 25, 1999SaveLearn
A strong-coupling theory of superfluid 4HeWe propose a new theoretical approach to the excitation spectrum of superfluid 4He. It is based on the assumption that, in addition to the usual Feynman density fluctuations, there exist…N. Gov, E. Akkermans·Oct 25, 1999SaveLearn
Correlated atomic motion, phonons and spin-ordering in bcc 3HeWe propose a new way to treat nuclear magnetism of solid 3He. We argue that the magnetic interaction arises indirectly as a consequence of correlated zero-point motion of the ions. This motion…N. Gov, E. Polturak·Oct 25, 1999SaveLearn
The Thermodynamics of the XXZ Heisenberg Chain with ImpuritiesIn this paper, we discuss the effect of the arbitrary spin impurities to the spin-1/2 and spin-1 XXZ model. The effect of ground state, the free energy, the magnetic susceptibility, the specific heat…Boyu Hou, Kangjie Shi, Ruihong Yue et al.·Oct 25, 1999SaveLearn
Integrability of the Heisenberg Chains with Boundary Impurities and Their Bethe AnsatzIn this paper, we show the integrability of spin-1/2 XXZ Heisenberg chain with two arbitrary spin boundary Impurities. By using the fusion method, we generalize it to the spin-1 XXZ chain. Then the…Boyu Hou, Kangjie Shi, Ruihong Yue et al.·Oct 25, 1999SaveLearn
Bethe Ansatz for the Spin-1 XXX Chain with Two ImpuritiesBy using algebraic Bethe ansatz method, we give the Hamitonian of the spin-1 XXX chain associated with sl2 with two boundary impurities.Boyu Hou, Kangjie Shi, Ruihong Yue et al.·Oct 25, 1999SaveLearn
Confinement of two-dimensional excitons in a non-homogeneous magnetic fieldThe effective Hamiltonian describing the motion of an exciton in an external non-homogeneous magnetic field is derived. The magnetic field plays the role of an effective potential for the exciton…J. A. K. Freire, A. Matulis, F. M. Peeters et al.·Oct 22, 1999SaveLearn
Fluctuations in random RL-C networks: non-linear σ- model descriptionDisordered RL-C networks are known to be an adequate model for describing fluctuations of electric fields in a random metal-dielectric composite. We show that under appropriate conditions the…Yan V. Fyodorov·Oct 22, 1999SaveLearn
Electrochemical capacitance of a leaky nano-capacitorWe report a detailed theoretical investigation on electrochemical capacitance of a nanoscale capacitor where there is a DC coupling between the two conductors. For this ``leaky'' quantum…Xuean Zhao, Jian Wang, Hong Guo·Oct 22, 1999SaveLearn
Effective action and collective modes in quasi-one-dimensional spin-density-wave systemsWe derive the effective action describing the long-wavelength low-energy collective modes of quasi-one-dimensional spin-density-wave (SDW) systems, starting from the Hubbard model within weak…K. Sengupta, N. Dupuis·Oct 21, 1999SaveLearn
Cumulant ratios and their scaling functions for Ising systems in strip geometriesWe calculate the fourth-order cumulant ratio (proposed by Binder) for the two-dimensional Ising model in a strip geometry L x oo. The Density Matrix Renormalization Group method enables us to…Andrzej Drzewinski, Jacek Wojtkiewicz·Oct 21, 1999SaveLearn
A superfluid hydrodynamic model for the enhanced moments of inertia of molecules in liquid 4HeWe present a superfluid hydrodynamic model for the increase in moment of inertia, ΔI, of molecules rotating in liquid 4He. The static inhomogeneous He density around each molecule (calculated…C. Callegari, A. Conjusteau, I. Reinhard et al.·Oct 21, 1999SaveLearn
Dynamics of Excited Electrons in Copper and Ferromagnetic Transition Metals: Theory and ExperimentBoth theoretical and experimental results for the dynamics of photoexcited electrons at surfaces of Cu and the ferromagnetic transition metals Fe, Co, and Ni are presented. A model for the dynamics…R. Knorren, K. H. Bennemann, R. Burgermeister et al.·Oct 21, 1999SaveLearn
Persistence exponents in a 3D symmetric binary fluid mixtureThe persistence exponent, theta, is defined by NF sim ttheta, where t is the time since the start of the coarsening process and the "no-flip fraction", NF, is the number of points that…V. M. Kendon, M. E. Cates, J-C. Desplat·Oct 21, 1999SaveLearn
Effect of Dephasing on Charge-Counting Statistics in Chaotic CavitiesWe calculate the cumulants of the charge transmitted through a chaotic cavity in the limit that the two openings have a large number of scattering channels. The shot noise, which is the second…Ya. M. Blanter, H. Schomerus, C. W. J. Beenakker·Oct 21, 1999SaveLearn
Quantized Skyrmion Fields in 2+1 DimensionsA fully quantized field theory is developped for the skyrmion topological excitations of the O(3) symmetric CP1-Nonlinear Sigma Model in 2+1D. The method allows for the obtainment of arbitrary…E. C. Marino·Oct 21, 1999SaveLearn
Quasi-particle characteristics of the one-dimensional polaronThe main quasi-particle characteristics of the one-dimensional polaron are estimated within and beyond the most general Gaussian approximation at arbitrary electron-phonon coupling. We have derived…G. Ganbold·Oct 21, 1999SaveLearn
Nonlinear Spin Polarized Transport Through a Quantum DotWe present a theoretical analysis of the nonlinear bias and temperature dependence of current-voltage characteristics of a spin-valve device which is formed by connecting a quantum dot to two…Baigeng Wang, Jian Wang, Hong Guo·Oct 21, 1999SaveLearn
Universal Behaviour of the Superfluid Fraction and Tc of He-3 in 99.5% Open AerogelWe have investigated the superfluid transition of He-3 in a 99.5% porosity silica aerogel. This very dilute sample shows behaviour intermediary between bulk He-3 and He-3 confined to the denser…G. Lawes, S. C. J. Kingsley, N. Mulders et al.·Oct 20, 1999SaveLearn
The Exact Solution of the SU(3) Hubbard ModelThe Bethe ansatz equations of the 1-D SU(3) Hubbard model are systematically derived by diagonalizing the inhomogeneous transfer matrix of the XXX model. We first derive the scattering matrix of the…Buoyu Hou, Dantao Peng, Ruihong Yue·Oct 20, 1999SaveLearn
Proposal for an Experiment to Test a Theory of High Temperature SuperconductorsA theory for the phenomena observed in Copper-Oxide based high temperature superconducting materials derives an elusive time-reversal and rotational symmetry breaking order parameter for the observed…C. M. Varma·Oct 20, 1999SaveLearn