Stuttgart 2012 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 32: Ultra-cold atoms, ions and BEC I

Q 32.3: Vortrag

Dienstag, 13. März 2012, 14:45–15:00, V7.02

Quantum stochastic description of collisions in a canonical Bose gas — •Patrick Navez1 and Achilleas Lazarides21Institut für Theoretische Physik, TU Dresden, 01062 Dresden, Germany — 2Max Planck Institute for the Physics of Complex Systems, 01187 Dresden, Germany

We derive a stochastic process that describes the kinetics of a one-dimensional Bose gas in a regime where three body collisions are important. In this situation the system becomes non integrable offering the possibility to investigate dissipative phenomena more simply compared to higher dimensional gases. Unlike the quantum Boltzmann equation describing the average momentum distribution, the stochastic approach allows a description of higher-order correlation functions in a canonical ensemble. As will be shown, this ensemble differs drastically from the grand canonical one. We illustrate the use of this method by determining the time evolution of the momentum mode particle number distribution and the static structure factor during the evaporative cooling process.

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