Heidelberg 2015 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 15: Poster: Quantum Optics and Photonics I

Q 15.41: Poster

Montag, 23. März 2015, 17:00–19:00, C/Foyer

Bogoliubov Theory of Dipolar Bose Gas in Weak Random Potential — •Mahmoud Ghabour¹ and Axel Pelster² — ¹Physics Department, Freie Universität Berlin, Germany — ²Physics Department and Research Center OPTIMAS, Technische Universität Kaiserslautern, Germany

We consider a dilute homogeneous Bose gas with both an isotropic short-range contact interaction and an anisotropic long-range dipole-dipole interaction in a weak random potential at low temperature in three dimensions. Within the realm of Bogoliubov theory we analyze how both condensate and superfluid density are depleted due to quantum and thermal fluctuations as well as disorder fluctuations. Afterwards, we calculate with this the resulting velocities of first and second sound within an anisotropic extension of the Landau-Khalatinikov two-fluid model.

[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)

[3] B. Nikolic, A. Balaz, and A. Pelster, Phys. Rev. A 88, 013624 (2013)

[4] M. Ghabour and A. Pelster, arXiv:1410.3070