Boiling a Unitary Fermi Liquid
Name
PhysRevLett.122.093401.pdf
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497.58 KB
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Checksum (MD5)
19891aa76c0c4e11bd6294f59c7343ad
Author(s)
Yan, Zhenjie
Patel, Parth Bharatkumar
Mukherjee, Biswaroop
Fletcher, Richard J
Struck, Julian
Zwierlein, Martin Wolfram
Date Issued
March 2019
Journal
Physical Review Letters
Publisher
American Physical Society Physics
Citation
Yan, Zhenjie et al. "Boiling a Unitary Fermi Liquid." Physical Review Letters 122, 9 (March 2019) DOI: 10.1103/PhysRevLett.122.093401 © 2019 The Author(s)
Version
Final published version
Abstract
We study the thermal evolution of a highly spin-imbalanced, homogeneous Fermi gas with unitarity limited interactions, from a Fermi liquid of polarons at low temperatures to a classical Boltzmann gas at high temperatures. Radio-frequency spectroscopy gives access to the energy, lifetime, and short-range correlations of Fermi polarons at low temperatures T. In this regime, we observe a characteristic T^{2} dependence of the spectral width, corresponding to the quasiparticle decay rate expected for a Fermi liquid. At high T, the spectral width decreases again towards the scattering rate of the classical, unitary Boltzmann gas, ∝T^{-1/2}. In the transition region between the quantum degenerate and classical regime, the spectral width attains its maximum, on the scale of the Fermi energy, indicating the breakdown of a quasiparticle description. Density measurements in a harmonic trap directly reveal the majority dressing cloud surrounding the minority spins and yield the compressibility along with the effective mass of Fermi polarons.
MIT Department
MIT-Harvard Center for Ultracold Atoms
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DOI of Published Version
https://doi.org/10.1103/PhysRevLett.122.093401
