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 to mode...

Full description

Saved in:
Bibliographic Details
Published in:Physical review letters 2015-09, Vol.115 (13), p.135302-135302, Article 135302
Main Authors: Cetina, Marko, Jag, Michael, Lous, Rianne S, Walraven, Jook T M, Grimm, Rudolf, Christensen, Rasmus S, Bruun, Georg M
Format: Article
Language:English
Subjects:
Atom interferometry
Fermi liquids
Impurities
Mathematical analysis
Pictures
Scattering
Strength
Three dimensional
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
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 scattering of quasiparticles in the Fermi liquid picture.
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.115.135302