Düsseldorf 2007 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 1: Quantengase (jointly with Q)

A 1.5: Vortrag

Montag, 19. März 2007, 11:30–11:45, 6J

Scissors Mode of a Strongly Interacting Fermi gas — •Stefan Riedl¹, Alexander Altmeyer¹, Christoph Kohstall¹, Matthew Wright¹, Johannes Hecker Denschlag¹, and Rudolf Grimm^1,2 — ¹Inst. of Experimental Physics and Center for Quantum Physics, Univ. Innsbruck, 6020 Innsbruck, Austria — ²Inst. for Quantum Optics and Quantum Information, Acad. of Science, 6020 Innsbruck, Austria

A powerful method to investigate ultracold strongly interacting fermionic quantum gases is the study of collective excitation modes of the gas. Their behavior reveals the different regimes the gas can enter depending on the coupling between the Fermions. Here the scissors mode plays an important role since the qualitative behavior of the mode is different in a collisionless and hydrodynamic gas, respectively. Together with the low damping of the mode this allowed us to study the hydrodynamic to collisionless transition of the gas as a function of temperature. To distinguish between superfluid and collisional hydrodynamics we investigate the scissors mode in a slowly rotating trap, where the dynamic behavior of a superfluid is different compared to a normal gas.