Frankfurt 2006 – scientific programme

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Q: Quantenoptik und Photonik

Q 14: Quantengase III

Q 14.1: Talk

Monday, March 13, 2006, 17:00–17:15, HVI

Critical Temperature of Chromium Condensate — •Konstantin Glaum¹, Axel Pelster², Hagen Kleinert¹, and Tilman Pfau³ — ¹Fachbereich Physik, Freie Universität Berlin, Arnimallee 14, 14195 Berlin, Germany — ²Fachbereich Physik, Universität Duisburg-Essen, Universitätsstraße 5, 45117 Essen, Germany — ³5. Physikalisches Institut, Universität Stuttgart, Pfaffenwaldring 57, 70569 Stuttgart, Germany

We estimate the critical temperature for the ongoing Stuttgart experiment on the Bose-Einstein condensation of chromium [1,2]. Due to the diluteness of the gas, we treat both the short-range, isotropic delta-interaction and the long-range, anisotropic magnetic dipole-dipole interaction perturbatively with the help of Feynman’s diagrammatic technique of many-body theory. Depending whether the symmetry axes of the trap and the magnetic dipole-dipole interaction are parallel or perpendicular to each other, the critical temperature is shifted above or below the interaction-free case. The difference of the critical temperatures between both configurations only depends on the magnetic dipole-dipole interaction and can be enhanced by increasing either the number of chromium atoms or the anisotropy of the trap.

[1] A. Griesmaier, J. Werner, S. Hensler, J. Stuhler, and T. Pfau: Phys. Rev. Lett. 94, 160401 (2005)

[2] J. Stuhler, A. Griesmaier, T. Koch, M. Fattori, S. Giovanazzi, P. Pedri, L. Santos, and T. Pfau: Phys. Rev. Lett. 95, 150406 (2005)