Berlin 2014 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 34: Poster: Ultra-cold atoms, ions and BEC (with Q)

A 34.15: Poster

Mittwoch, 19. März 2014, 16:30–18:30, Spree-Palais

Measurements of Impurity Coherence in a Fermi Sea by Spin Echo — Marko Cetina¹, •Rianne S. Lous^1,2, Michael Jag^1,2, Florian Schreck^1,3, Rudolf Grimm^1,2, Rasmus S. Christensen⁴, and Georg M. Bruun⁴ — ¹Insitut für Quantenoptik and Quanteninformation (IQOQI), Österreichische Akademie der Wissenschaften, Innsbruck, Austria — ²Insitut für Experimental Physik, Universität Innsbruck, Innsbruck, Austria — ³Institute of Physics, University of Amsterdam, Amsterdam, Netherlands — ⁴Department of Physics and Astronomy, University of Aarhus, Aarhus, Denmark

We investigate the decoherence of a fermionic ⁴⁰K impurity that arises from collisions with a Fermi sea of ⁶Li using the spin-echo technique. We use a Feshbach resonance to tune the interaction of the impurity with the sea. We measure the decoherence rate of the ⁴⁰K impurity for various interaction strengths and temperatures. From this, the collision rate of the impurity with the sea can be computed. The results show good agreement with a theory based on the Fermi Liquid picture.