Berlin 2014 – scientific programme
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A: Fachverband Atomphysik
A 34: Poster: Ultra-cold atoms, ions and BEC (with Q)
A 34.15: Poster
Wednesday, March 19, 2014, 16:30–18:30, Spree-Palais
Measurements of Impurity Coherence in a Fermi Sea by Spin Echo — Marko Cetina1, •Rianne S. Lous1,2, Michael Jag1,2, Florian Schreck1,3, Rudolf Grimm1,2, 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.