Stuttgart 2012 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 34: Poster 1

Q 34.28: Poster

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

Dipolar Bose-Einstein Condensates in Weak Anisotropic Disorder Potentials — •Branko Nikolić1, Antun Balaž1, and Axel Pelster21Scientific Computing Laboratory, Institute of Physics Belgrade, University of Belgrade, Serbia — 2Hanse-Wissenschaftskolleg, Delmenhorst, Germany

We explore the peculiar properties of ultracold Bose gases which emerge from the delicate interplay between an anisotropic two-particle interaction and an anisotropic random potential. To this end we consider homogeneous Bose-Einstein condensates with both dipolar and contact interaction in weak disorder potentials which are characterized by an anisotropic Lorentzian correlation distribution in Fourier space. Solving perturbatively the Gross-Pitaevskii equation to second order with respect to the disorder potential allows to calculate analytically the disorder-ensemble averages for the condensate and superfluid depletion, the equation of state, and the sound velocity. Apart from reproducing previous special cases [1,2], these properties show characteristic anisotropies which arise from the formation of fragmented dipolar condensates in the minima of the anisotropic disorder potential.
[1] K. Huang and H. F. Meng, Phys. Rev. Lett. 69, 644 (1992).
[2] C. Krumnow and A. Pelster, Phys. Rev. A 84, 021608(R) (2011).

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