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DY: Dynamik und Statistische Physik

DY 17: Superfluidity and Bose-Einstein-Condensation

DY 17.2: Vortrag

Montag, 27. März 2006, 17:30–17:45, SCH 251

Emergence of superfluidity in the dynamics of a Bose-Einstein condensate in a parabolic lattice — •Joachim Brand¹ and Andrey Kolovsky^1,2 — ¹Max-Planck-Institut für Physik komplexer Systeme, D-01187 Dresden, Germany — ²Kirensky Institute of Physics, 660036 Krasnoyarsk, Russia

The dynamics of a Bose-Einstein condensate is studied in a combined periodic plus harmonic external potential. The emergence and breakdown of superfluid transport in this system is analysed from a nonlinear-dynamics point of view. Unexpected regimes of stable collective dipole and Bloch oscillations are identified and explained in terms of quantum mechanical and classical pendulum models[1]. The theoretical analysis is supported by full numerical solutions of the discrete and continuous nonlinear Schrödinger equation.

[1] J. Brand and A. R. Kolovsky. E-print cond-mat/0412549