Stuttgart 2012 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 35: Poster 2

Q 35.3: Poster

Wednesday, March 14, 2012, 16:30–19:00, Poster.I+II

Extension of Landau-Khalatnikov Two-Fluid Model for Anisotropic Quantum Gases — •Carolin Wille¹ and Axel Pelster² — ¹Fachbereich Physik, Freie Universität Berlin, Germany — ²Hanse-Wissenschatskolleg, Delmenhorst, Germany

Dipolar Bose-Einstein condensates (BEC) at zero temperature with weak disorder [1] as well as at finite temperature without disorder [2] possess anisotropic superfluid properties which are not described by the standard hydrodynamic Landau-Khalatnikov (LK) theory. In order to cope with a tensorial superfluid density, we extend the LK equations by working out and comparing two different methods – first by Hamilton’s principle of least action and second by a conservation law approach analog to the initial work of Landau and Khalatnikov. Finally, a linearization of the extended LK equations yields the first and second sound with a characteristic direction dependence which can be further specialized for a dipolar BEC.
[1] C. Krumnow and A. Pelster, Phys. Rev. A 84, 021608(R) (2011).
[2] T. Checinski and A. Pelster, to be published.