Hannover 2020 – wissenschaftliches Programm
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MO 18.3: Vortrag
Donnerstag, 12. März 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 . 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 , the stability of a molecular electric system turns out to strongly depend on its geometry and the FS deformation significantly increases . 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.
 L. De Marco et al., Science 363, 853 (2019)
 V. Veljić et al., New J. Phys. 20, 093016 (2018)
 V. Veljić et al., Phys. Rev. Res. 1, 012009 (2019)