The Scattering and Coherence of a Fermi Polaron

ORAL

Abstract

We probe the coherence of a strongly interacting $^{40}$K impurity in a Fermi sea of ${^6}$Li atoms using time-resolved Ramsey spectroscopy. The measured variation of the coherence with the interaction strength and temperature is well-explained by the low-energy scattering of the impurity in the Fermi liquid picture. For very strong interactions, we observe additional dynamics arising from the dressing of the impurity by its environment.

*We acknowledge support by the Austrian Science Fund (FWF) through the SFB FoQuS.

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Authors

  • Marko Cetina

    • Institute for Quantum Optics and Quantum Information, Innsbruck

  • Michael Jag

    • Institute for Experimental Physics, Innsbruck University and Institute for Quantum Optics and Quantum Information, Innsbruck

  • Rianne Lous

    • Institute for Experimental Physics, Innsbruck University and Institute for Quantum Optics and Quantum Information, Innsbruck

  • Florian Schreck

    • Institute for Quantum Optics and Quantum Information, Innsbruck

  • Rudolf Grimm

    • Institute for Quantum Optics and Quantum Information, Innsbruck and Institute for Experimental Physics, Innsbruck University

  • Rasmus S{\O}rensen

    • Department of Physics and Astronomy, University of Aarhus

  • Georg Bruun

    • Department of Physics and Astronomy, University of Aarhus