Stuttgart 2012 – wissenschaftliches Programm
Q 35.3: Poster
Mittwoch, 14. März 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  as well as at finite temperature without disorder 
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.
 C. Krumnow and A. Pelster, Phys. Rev. A 84, 021608(R) (2011).
 T. Checinski and A. Pelster, to be published.