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 Pelster2 — 1Scientific 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).