Stuttgart 2012 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 7: Quantengase: Fermionen

Q 7.8: Vortrag

Montag, 12. März 2012, 15:45–16:00, V47.02

Low-Lying Excitation Modes of a Dipolar Fermi Gas: From Collisionless to Hydrodynamic Regime — •Falk Wächtler1, Aristeu Lima2, and Axel Pelster31Institut für Physik und Astronomie, Universität Potsdam, Germany — 2Departamento de Física - Universidade Federal do Ceará, Fortaleza - Brazil — 3Hanse-Wissenschatskolleg, Delmenhorst, Germany

By means of the Boltzmann-Vlasov equation we investigate dynamical properties of a trapped dipolar Fermi gas. In order to determine an approximative solution, we follow Ref. [1] and rescale both space and momentum variables, thus obtaining ordinary differential equations for the respective scaling parameters. Then, we procced by linearizing these equations around the equilibrium in order to study the low-lying excitations of the system. Within the relaxation-time approximation for the collisional integral, our approach is able to describe the low-lying excitations all the way from the collisionless [2] to the hydrodynamic [3] regime.

[1] P.Pedri, D. Guery-Odelin, and S. Stringari, Phys. Rev. A 68 043608 (2003).
[2] T. Sogo, L. He, T. Miyakawa, S. Yi, H. Lu, and H. Pu, New J. Phys. 11, 055017 (2009).
[3] A.R.P. Lima and A. Pelster, Phys. Rev. A 81, 021606(R) and 063629 (2010).

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