Boiling a Unitary Fermi Liquid
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-r...
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| Format: | Article |
| Language: | English |
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American Physical Society Physics
2019
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| Online Access: | http://hdl.handle.net/1721.1/121057 https://orcid.org/0000-0003-1543-279X https://orcid.org/0000-0001-5267-3168 https://orcid.org/0000-0002-7155-5412 https://orcid.org/0000-0002-9728-1632 https://orcid.org/0000-0001-8120-8548 |
| _version_ | 1826206140759801856 |
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| author | Yan, Zhenjie Patel, Parth Bharatkumar Mukherjee, Biswaroop Fletcher, Richard J Struck, Julian Zwierlein, Martin Wolfram |
| author2 | MIT-Harvard Center for Ultracold Atoms |
| author_facet | MIT-Harvard Center for Ultracold Atoms Yan, Zhenjie Patel, Parth Bharatkumar Mukherjee, Biswaroop Fletcher, Richard J Struck, Julian Zwierlein, Martin Wolfram |
| author_sort | Yan, Zhenjie |
| collection | MIT |
| description | 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. |
| first_indexed | 2024-09-23T13:24:44Z |
| format | Article |
| id | mit-1721.1/121057 |
| institution | Massachusetts Institute of Technology |
| language | English |
| last_indexed | 2024-09-23T13:24:44Z |
| publishDate | 2019 |
| publisher | American Physical Society Physics |
| record_format | dspace |
| spelling | mit-1721.1/1210572022-10-01T15:07:28Z Boiling a Unitary Fermi Liquid Yan, Zhenjie Patel, Parth Bharatkumar Mukherjee, Biswaroop Fletcher, Richard J Struck, Julian Zwierlein, Martin Wolfram MIT-Harvard Center for Ultracold Atoms Yan, Zhenjie Patel, Parth Bharatkumar Mukherjee, Biswaroop Fletcher, Richard J Struck, Julian Zwierlein, Martin 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. United States. National Science Foundation. (Award PHY-1734011) United States. National Science Foundation. (Award PHY-1506019) United States. Air Force. Office of Scientific Research (Grant FA9550-16-1-0324) United States. Air Force. Office of Scientific Research. Multidisciplinary University Research Initiative (Grant FA9550-14-1-0035) United States. Office of Naval Research (Grant N00014-17-1-2257) 2019-03-22T16:52:26Z 2019-03-22T16:52:26Z 2019-03 2018-11 2019-03-06T18:00:11Z Article http://purl.org/eprint/type/JournalArticle 0031-9007 1079-7114 http://hdl.handle.net/1721.1/121057 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) https://orcid.org/0000-0003-1543-279X https://orcid.org/0000-0001-5267-3168 https://orcid.org/0000-0002-7155-5412 https://orcid.org/0000-0002-9728-1632 https://orcid.org/0000-0001-8120-8548 en http://dx.doi.org/10.1103/PhysRevLett.122.093401 Physical Review Letters Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use. American Physical Society application/pdf American Physical Society Physics American Physical Society |
| spellingShingle | Yan, Zhenjie Patel, Parth Bharatkumar Mukherjee, Biswaroop Fletcher, Richard J Struck, Julian Zwierlein, Martin Wolfram Boiling a Unitary Fermi Liquid |
| title | Boiling a Unitary Fermi Liquid |
| title_full | Boiling a Unitary Fermi Liquid |
| title_fullStr | Boiling a Unitary Fermi Liquid |
| title_full_unstemmed | Boiling a Unitary Fermi Liquid |
| title_short | Boiling a Unitary Fermi Liquid |
| title_sort | boiling a unitary fermi liquid |
| url | http://hdl.handle.net/1721.1/121057 https://orcid.org/0000-0003-1543-279X https://orcid.org/0000-0001-5267-3168 https://orcid.org/0000-0002-7155-5412 https://orcid.org/0000-0002-9728-1632 https://orcid.org/0000-0001-8120-8548 |
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