Düsseldorf 2007 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 12: Quantengase (Unordnung)
Q 12.3: Talk
Monday, March 19, 2007, 17:00–17:15, 6J
Thermodynamics of a Bose-Einstein Condensate with Weak Disorder — •Giovanni Falco, Axel Pelster, and Robert Graham — Fachbereich Physik, Universität Duisburg-Essen, Lotharstraße 1, 47048 Duisburg, Germany
We determine the thermodynamic properties of a homogeneous superfluid dilute Bose gas in presence of weak quenched disorder. To this end we extend the Bogoliubov theory of Huang and Meng [1] to finite temperatures by applying both the Popov and the many-body T-Matrix approach. Within a high-temperature approximation we derive self-consistent equations for the temperature dependence of both the condensate density and the s-wave scattering length which generalize the theory of Ref. [2]. Their solution allows to calculate how the temperatures Tc and Ts, which characterize the onset of Bose-Einstein condensation and superfluidity, respectively, depend on the strengths of disorder and contact interaction.
[1] K. Huang and H.F. Meng, Phys. Rev. Lett. 69, 644 (1992)
[2] A.V. Lopatin and V.M. Vinokur, Phys. Rev. Lett. 88, 235503 (2002)