Hannover 2020 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 52: Cold Molecules II (joint session Q/MO)

Q 52.3: Talk

Thursday, March 12, 2020, 14:45–15:00, f442

Stability of quantum degenerate Fermi gases of tilted polar molecules — •Vladimir Veljić¹, Axel Pelster², and Antun Balaž¹ — ¹Center for the Study of Complex Systems, Institute of Physics Belgrade, University of Belgrade, Serbia — ²Physics Department and Research Center OPTIMAS, Technische Universität Kaiserslautern, Germany

A recent experimental realization of quantum degenerate gas of ⁴⁰K⁸⁷Rb molecules opens up prospects of exploring strongly dipolar Fermi gases and many-body phenomena arising in that regime [1]. Here we derive a mean-field variational approach based on the Wigner function for the description of ground-state properties of such systems [2,3]. We show that the stability of dipolar fermions in a general harmonic trap is universal as it only depends on the trap aspect ratios and the dipoles orientation. We calculate the species-independent stability diagram and the deformation of the Fermi surface (FS) for polarized molecules, whose electric dipoles are oriented along a preferential direction. Compared to atomic magnetic species [2], the stability of a molecular electric system turns out to strongly depend on its geometry and the FS deformation significantly increases [3]. We also show that tuning the trap frequencies appropriately reduces the 3D sytem to a quasi-2D system of either a pancake- or a cigar-shaped gas cloud, which turn out to have smaller stability regions.

[1] L. De Marco et al., Science 363, 853 (2019)

[2] V. Veljić et al., New J. Phys. 20, 093016 (2018)

[3] V. Veljić et al., Phys. Rev. Res. 1, 012009 (2019)