Hamburg 2009 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 17: Quantengase: Bosonen Dynamik / Disorder

Q 17.2: Talk

Tuesday, March 3, 2009, 10:45–11:00, VMP 6 HS-A

Dynamical aspects of Bose-Einstein condensation — •Alexej Schelle^1,2, Thomas Wellens¹, Dominique Delande², and Andreas Buchleitner¹ — ¹Albert-Ludwigs-Universität Freiburg, Hermann-Herder-Str. 3, 79104 Freiburg — ²Laboratoire Kastler-Brossel, Université Pierre et Marie Curie-Paris 6, ENS, CNRS; 4 Place Jussieu, F-75005 Paris, France

We present a non-phenomenological, particle number conserving quantum master equation theory for trapped Bose-Einstein condensates out of thermal equilibrium. Based on the separation of time scales between the condensate and non-condensate dynamics, the condensate master equation is derived taking into account all possible two-particle interaction processes. We study the so obtained times scales for non-equilibrium dynamics in the dilute gas limit, and show that they are determined with negligible corrections by properties of a non-interacting gas. As a fundamental application, we study the process of Bose-Einstein condensation quantitatively, which reduces to an evolution equation for the condensate particle number distribution in a gas of exactly N particles.