Darmstadt 2008 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 47: Quantengase (Bosonen II / Fermionen)

Q 47.9: Vortrag

Donnerstag, 13. März 2008, 18:30–18:45, 1A

Dynamics of a trapped spinor Fermi gas — Nils Bornemann, •Philipp Hyllus, and Luis Santos — Institut für Theoretische Physik, Leibniz-Universität Hannover, Appelstr. 2, 30167 Hannover

We investigate the spin dynamics of an atomic Fermi gas with a spin of f≥3/2 in a harmonic trap. Spin-changing collisions, which induce a population tranfer between different spin components, are largely suppressed in the presence of a sufficiently large magnetic field due to the quadratic Zeeman effect.

We derive the corresponding Master equation, and neglecting coherences, we simulate the equivalent rate equation for the populations including the supressing effects of the quadratic Zeeman effect, and the trap anharmonicity. We will show that the interplay between anharmonicity and quadratic Zeeman effect leads to a resonant enhancement of the spin-changing collisions as a function of the applied magnetic field. This effect should have clearly observable consequences especially for fermions in deep optical lattices, since for bosons under the same conditions the resonances would be absent.