Stuttgart 2012 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 34: Poster 1
Q 34.34: Poster
Tuesday, March 13, 2012, 16:30–19:00, Poster.I+II
Bogoliubov Theory for Dipolar Bose Gas at Low Temperatures — •Tomasz Checinski1 and Axel Pelster2 — 1Fakultät 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.