Hannover 2010 – scientific programme

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A: Fachverband Atomphysik

A 23: Poster II

A 23.30: Poster

Thursday, March 11, 2010, 16:30–19:00, Lichthof

Stability and free expansion of a trapped dipolar Fermi gas — •Liang He^1,2 and Su Yi¹ — ¹Institute of theoretical physics, Chinese Academy of Sciences, Beijing, China — ²Institut für Theoretische Physik, Johann Wolfgang Goethe Universität Frankfurt (Main), Germany

The amazing experimental progress in making degenerate ultracold polar molecules [1] is making ultracold dipolar systems a fascinating research field. For spin polarized ultracold dipolar Fermi gases, the properties of the systems are determined by the dominant dipolar interactions, since the s-wave short-range interactions are strongly suppressed by the Pauli exclusion principle. We investigate the stability of a trapped spin polarized dipolar Fermi gas by a full numerical calculation of the phase space distribution function of the system. We present a stability phase diagram and show that stabilizing the system by tuning the trap geometry is generally inefficient [2]. We further show that the expanded gas always gets stretched along the direction of dipole moment [2, 3].

[1] S. Ospelkaus, A. Pe’er, K.-K. Ni, J. J. Zirbel, B. Neyenhuis, S. Kotochigova, P. S. Julienne, J. Ye, and D. S. Jin, Nature Physics 4, 622 (2008).

[2] L. He, J.-N. Zhang, Yunbo Zhang,and S. Yi, Phys. Rev. A 77, 031605(R) (2008).

[3] T. Sogo, L. He, T. Miyakawa, S. Yi, H. Lu, and H. Pu, New J. Phys. 11, 055017 (2009).