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Heidelberg 2015 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 38: Ultracold Atoms, Ions and BEC III (with A)

Q 38.6: Talk

Wednesday, March 25, 2015, 12:15–12:30, M/HS1

Fast Dynamics of a Fermi ImpurityMarko Cetina1, •Michael Jag1,2, Rianne Lous1,2, Rudolf Grimm1,2, Rasmus Sørensen3, and Georg Bruun31IQOQI, Österreichische Akademie der Wissenschaften, Innsbruck, Austria — 2Inst. für Experimentalphysik, Universität Innsbruck, Innsbruck, Austria — 3Department of Physics and Astronomy, University of Aarhus, Aarhus, Denmark

We use Ramsey and spin-echo spectroscopy to probe the dynamics of a 40K impurity in a degenerate Fermi sea of 6Li atoms. At slow timescales (t>200 µs), the evolution of the impurity is dominated by elastic collisions with the background 6Li atoms. The measured rate of elastic collisions as a function of the interaction strength and temperature is in very good agreement with the Fermi liquid picture. We employ a laser-induced resonance shift to rapidly vary the interaction strength and perform quenches of the impurity into the strongly interacting regime. At very short times after the quench (t<20 µs), we observe quantum dynamics of the impurity interacting with the Fermi sea. This investigation opens the possibility to observe the pairing dynamics in a Fermi gas and the formation of polaron states.

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