Decoherence of Impurities in a Fermi Sea of Ultracold Atoms

We investigate the decoherence of \(^{40}\)K impurities interacting with a three-dimensional Fermi sea of \(^{6}\)Li 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...

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Published inarXiv.org
Main Authors Cetina, Marko, Jag, Michael, Lous, Rianne S, Jook T M Walraven, Grimm, Rudolf, Christensen, Rasmus S, Bruun, Georg M
Format Paper Journal Article
LanguageEnglish
Published Ithaca Cornell University Library, arXiv.org 04.05.2015
Subjects
Atom interferometry
Fermi liquids
Impurities
Physics - Quantum Gases
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Summary:We investigate the decoherence of \(^{40}\)K impurities interacting with a three-dimensional Fermi sea of \(^{6}\)Li 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.
ISSN:2331-8422
DOI:10.48550/arxiv.1505.00738