Spectral Response and Contact of the Unitary Fermi Gas
© 2019 American Physical Society. We measure radio frequency (rf) spectra of the homogeneous unitary Fermi gas at temperatures ranging from the Boltzmann regime through quantum degeneracy and across the superfluid transition. For all temperatures, a single spectral peak is observed. Its position smo...
| Main Authors: | , , , , , |
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| Other Authors: | |
| Format: | Article |
| Language: | English |
| Published: |
American Physical Society (APS)
2021
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| Online Access: | https://hdl.handle.net/1721.1/134806 |
| _version_ | 1826200350211702784 |
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| author | Mukherjee, Biswaroop Patel, Parth B Yan, Zhenjie Fletcher, Richard J Struck, Julian Zwierlein, Martin W |
| author2 | MIT-Harvard Center for Ultracold Atoms |
| author_facet | MIT-Harvard Center for Ultracold Atoms Mukherjee, Biswaroop Patel, Parth B Yan, Zhenjie Fletcher, Richard J Struck, Julian Zwierlein, Martin W |
| author_sort | Mukherjee, Biswaroop |
| collection | MIT |
| description | © 2019 American Physical Society. We measure radio frequency (rf) spectra of the homogeneous unitary Fermi gas at temperatures ranging from the Boltzmann regime through quantum degeneracy and across the superfluid transition. For all temperatures, a single spectral peak is observed. Its position smoothly evolves from the bare atomic resonance in the Boltzmann regime to a frequency corresponding to nearly one Fermi energy at the lowest temperatures. At high temperatures, the peak width reflects the scattering rate of the atoms, while at low temperatures, the width is set by the size of fermion pairs. Above the superfluid transition, and approaching the quantum critical regime, the width increases linearly with temperature, indicating non-Fermi-liquid behavior. From the wings of the rf spectra, we obtain the contact, quantifying the strength of short-range pair correlations. We find that the contact rapidly increases as the gas is cooled below the superfluid transition. |
| first_indexed | 2024-09-23T11:35:06Z |
| format | Article |
| id | mit-1721.1/134806 |
| institution | Massachusetts Institute of Technology |
| language | English |
| last_indexed | 2024-09-23T11:35:06Z |
| publishDate | 2021 |
| publisher | American Physical Society (APS) |
| record_format | dspace |
| spelling | mit-1721.1/1348062023-02-17T18:58:10Z Spectral Response and Contact of the Unitary Fermi Gas Mukherjee, Biswaroop Patel, Parth B Yan, Zhenjie Fletcher, Richard J Struck, Julian Zwierlein, Martin W MIT-Harvard Center for Ultracold Atoms Massachusetts Institute of Technology. Research Laboratory of Electronics Massachusetts Institute of Technology. Department of Physics © 2019 American Physical Society. We measure radio frequency (rf) spectra of the homogeneous unitary Fermi gas at temperatures ranging from the Boltzmann regime through quantum degeneracy and across the superfluid transition. For all temperatures, a single spectral peak is observed. Its position smoothly evolves from the bare atomic resonance in the Boltzmann regime to a frequency corresponding to nearly one Fermi energy at the lowest temperatures. At high temperatures, the peak width reflects the scattering rate of the atoms, while at low temperatures, the width is set by the size of fermion pairs. Above the superfluid transition, and approaching the quantum critical regime, the width increases linearly with temperature, indicating non-Fermi-liquid behavior. From the wings of the rf spectra, we obtain the contact, quantifying the strength of short-range pair correlations. We find that the contact rapidly increases as the gas is cooled below the superfluid transition. 2021-10-27T20:09:16Z 2021-10-27T20:09:16Z 2019 2021-07-06T15:25:42Z Article http://purl.org/eprint/type/JournalArticle https://hdl.handle.net/1721.1/134806 en 10.1103/PHYSREVLETT.122.203402 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. application/pdf American Physical Society (APS) APS |
| spellingShingle | Mukherjee, Biswaroop Patel, Parth B Yan, Zhenjie Fletcher, Richard J Struck, Julian Zwierlein, Martin W Spectral Response and Contact of the Unitary Fermi Gas |
| title | Spectral Response and Contact of the Unitary Fermi Gas |
| title_full | Spectral Response and Contact of the Unitary Fermi Gas |
| title_fullStr | Spectral Response and Contact of the Unitary Fermi Gas |
| title_full_unstemmed | Spectral Response and Contact of the Unitary Fermi Gas |
| title_short | Spectral Response and Contact of the Unitary Fermi Gas |
| title_sort | spectral response and contact of the unitary fermi gas |
| url | https://hdl.handle.net/1721.1/134806 |
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