Frankfurt 2006 – scientific programme
Parts | Days | Selection | Search | Downloads | Help
Q: Quantenoptik und Photonik
Q 38: Quantengase IV
Q 38.9: Talk
Wednesday, March 15, 2006, 12:40–12:55, HVI
Mean-field expansion in Bose-Einstein condensates with finite-range interactions — •Michael Uhlmann1, Ralf Schützhold1, Yan Xu1, and Uwe R. Fischer2 — 1Institut für Theoretische Physik, Technische Universität Dresden, D-01062 Dresden — 2Eberhard-Karls-Universität Tübingen, Institut für Theoretische Physik, Auf der Morgenstelle 14, D-72076 Tübingen
We present a formal derivation of the mean-field expansion for dilute Bose-Einstein condensates with two-particle interaction potential which are weak and finite-range, but otherwise arbitrary. The expansion allows for a controlled investigation of the impact of the microscopic interaction details (e.g., the scaling behaviour) on the mean-field approach and the induced higher-order corrections beyond the s-wave scattering approximation. As an example, we calculate the quantum depletion in the presence of dipole-dipole interactions (in addition to the usual contact potential).