Stuttgart 2012 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 34: Poster 1

Q 34.34: Poster

Dienstag, 13. März 2012, 16:30–19:00, Poster.I+II

Bogoliubov Theory for Dipolar Bose Gas at Low Temperatures — •Tomasz Checinski1 and Axel Pelster21Fakultät für Physik, Universität Bielefeld, Germany — 2Hanse-Wissenschatskolleg, Delmenhorst, Germany

In this talk we extend the zero-temperature Bogoliubov theory for a homogeneous dipolar Bose gas of Ref. [1] to low temperatures. At first, we determine the validity region of the Bogoliubov theory in the plane spanned by the temperature and the gas parameter for varying dipolar interaction strength. To this end we demand that the combination of quantum and thermal depletion of the condensate remains small. Then we apply the anisotropic generalization of the Landau-Khalatnikov two-fluid model [2] in order to calculate the first and second sound velocity, respectively. The delicate interplay of the anisotropic dipolar interaction with both the quantum and the thermal fluctuations yields sound velocities with a characteristic angular dependence which should be detectable with modern Bragg spectroscopy.
[1] A.R.P. Lima and A. Pelster, Phys. Rev. A 84, 041604(R) (2011); arXiv:1111.0900
[2] C. Wille and A. Pelster, to be published.

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