Erlangen 2018 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 25: Quantum Gases (Fermions) I

Q 25.2: Talk

Monday, March 5, 2018, 16:30–16:45, K 1.022

Ground State of a Fermi Gas with Tilted Dipoles — •Vladimir Veljić1, Aristeu R. P. Lima2, Simon Baier3, Lauriane Chomaz3, Francesca Ferlaino4,5, Axel Pelster5, and Antun Balaž11Center for the Study of Complex Systems, Institute of Physics Belgrade, University of Belgrade, Serbia — 2University for International Integration of the Afro-Brazilian Lusophony, Brazil — 3Institute for Experimental Physics, University of Innsbruck, Austria — 4Institute for Quantum Optics and Quantum Information, Austrian Academy of Sciences, Innsbruck, Austria — 5Physics Department and Research Center OPTIMAS, Technical University of Kaiserslautern, Germany

In the presence of an anisotropic and long-range dipole-dipole interaction, the Fermi sphere of an ultracold Fermi gas deforms into an ellipsoid. Recently, it was experimentally observed in such systems that the shape of the Fermi surface follows the rotation of the dipoles when they are tilted [1]. Here we generalize the Hartree-Fock mean-field theory of Refs. [2, 3], where the dipoles were assumed to be parallel to one of the trap axes, to an arbitrary orientation of the dipoles and obtain the ground-state Thomas-Fermi radii and momenta. The calculated angular dependence of the Fermi surface deformation shows good agreement with experimental observations. We also find that the angular dependence of the aspect ratio turns out to be a direct consequence of the dipole tilting.

[1] K. Aikawa, et al., Science 345, 1484 (2014).

[2] F. Wächtler, et al., Phys. Rev. A 96, 043608 (2017).

[3] V. Veljić, et al., Phys. Rev. A 95, 053635 (2017).

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