Decoherence of Impurities in a Fermi Sea of Ultracold Atoms

2015/05/04 by Marko Cetina, Michael Jag, Rianne S. Lous +4 · 1 citation
Physics and Astronomy · #cond-mat.quant-gas

paper · pdf · doi:10.1103/physrevlett.115.135302

published as Phys. Rev. Lett. 115, 135302 (2015)

arxiv created 2015/05/04 · arxiv updated 2015/09/30

Abstract

We investigate the decoherence of ⁴⁰K impurities interacting with a three-dimensional Fermi sea of ⁶Li across an interspecies Feshbach resonance. The decoherence is measured as a function of the interaction strength and temperature using a spin-echo atom interferometry method. For weak to moderate interaction strengths, we interpret our measurements in terms of scattering of K quasiparticles by the Fermi sea and find very good agreement with a Fermi liquid calculation. For strong interactions, we observe significant enhancement of the decoherence rate, which is largely independent of temperature, pointing to behavior that is beyond the Fermi liquid picture.

Cited by

• Quantum Impurities as Probes of Finite-Temperature Fluctuations in Two-Dimensional Bose Gases
• Large anomalous shifts of potassium-39 Feshbach resonances

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