Mainz 2017 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 31: Poster: Quantum Optics and Photonics I
Q 31.13: Poster
Dienstag, 7. März 2017, 17:00–19:00, P OG1+2
Fermi Surface Deformation in Dipolar Fermi Gases — •Vladimir Veljić1, Antun Balaž1, and Axel Pelster2 — 1Scientific Computing Laboratory, Center for the Study of Complex Systems, Institute of Physics Belgrade, University of Belgrade, Serbia — 2Physics Department and Research center OPTIMAS, Technical University of Kaiserslautern, Germany
In a recent time-of-flight (TOF) expansion experiment with ultracold polarized fermionic erbium atoms, TOF images show that the atomic cloud has an ellipsoidal shape, with an elongation in the direction of atomic dipoles [1]. The Hartree-Fock mean-field theory presented in Refs. [2,3], which was restricted to the orientation of dipoles along one of the harmonic trap axes, is generalized here for an arbitrary orientation of dipoles. Afterwards, using this approach we analyze the resulting Fermi surface deformation, calculate TOF dynamics, and solve the corresponding Boltzmann-Vlasov equation within the relaxation-time approximation in the vicinity of a new equilibrium configuration by using a suitable rescaling of the equilibrium distribution. The resulting ordinary differential equations of motion for the scaling parameters are solved numerically for experimentally relevant parameters at zero temperature. A comparison of our analytical and numerical results with the Innsbruck experimental results [1] is also presented.
[1] K. Aikawa, et al., Science 345, 1484 (2014).
[2] F. Wächtler, A.R.P. Lima, and A. Pelster, arXiv:1311.5100 (2013).
[3] V. Veljić, A. Balaž, and A. Pelster, arXiv:1608.06448 (2016).