Correlations and Pair Formation in a Repulsively Interacting Fermi Gas
A degenerate Fermi gas is rapidly quenched into the regime of strong effective repulsion near a Feshbach resonance. The spin fluctuations are monitored using speckle imaging and, contrary to several theoretical predictions, the samples remain in the paramagnetic phase for an arbitrarily large scatte...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | en_US |
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American Physical Society
2012
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| Online Access: | http://hdl.handle.net/1721.1/72471 https://orcid.org/0000-0002-9717-129X https://orcid.org/0000-0002-9528-3044 |
| _version_ | 1826203649103101952 |
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| author | Gillen, Jonathon Isaiah Huang, Wujie Ketterle, Wolfgang Keshet, Aviv Su, Edward Joseph Sanner, Christian Burkhard |
| author2 | Massachusetts Institute of Technology. Department of Physics |
| author_facet | Massachusetts Institute of Technology. Department of Physics Gillen, Jonathon Isaiah Huang, Wujie Ketterle, Wolfgang Keshet, Aviv Su, Edward Joseph Sanner, Christian Burkhard |
| author_sort | Gillen, Jonathon Isaiah |
| collection | MIT |
| description | A degenerate Fermi gas is rapidly quenched into the regime of strong effective repulsion near a Feshbach resonance. The spin fluctuations are monitored using speckle imaging and, contrary to several theoretical predictions, the samples remain in the paramagnetic phase for an arbitrarily large scattering length. Over a wide range of interaction strengths a rapid decay into bound pairs is observed over times on the order of 10ℏ/E[subscript F], preventing the study of equilibrium phases of strongly repulsive fermions. Our work suggests that a Fermi gas with strong short-range repulsive interactions does not undergo a ferromagnetic phase transition. |
| first_indexed | 2024-09-23T12:40:52Z |
| format | Article |
| id | mit-1721.1/72471 |
| institution | Massachusetts Institute of Technology |
| language | en_US |
| last_indexed | 2024-09-23T12:40:52Z |
| publishDate | 2012 |
| publisher | American Physical Society |
| record_format | dspace |
| spelling | mit-1721.1/724712022-09-28T09:22:38Z Correlations and Pair Formation in a Repulsively Interacting Fermi Gas Gillen, Jonathon Isaiah Huang, Wujie Ketterle, Wolfgang Keshet, Aviv Su, Edward Joseph Sanner, Christian Burkhard Massachusetts Institute of Technology. Department of Physics Massachusetts Institute of Technology. Research Laboratory of Electronics MIT-Harvard Center for Ultracold Atoms Ketterle, Wolfgang Gillen, Jonathon Isaiah Huang, Wujie Ketterle, Wolfgang Keshet, Aviv Su, Edward Joseph Sanner, Christian Burkhard A degenerate Fermi gas is rapidly quenched into the regime of strong effective repulsion near a Feshbach resonance. The spin fluctuations are monitored using speckle imaging and, contrary to several theoretical predictions, the samples remain in the paramagnetic phase for an arbitrarily large scattering length. Over a wide range of interaction strengths a rapid decay into bound pairs is observed over times on the order of 10ℏ/E[subscript F], preventing the study of equilibrium phases of strongly repulsive fermions. Our work suggests that a Fermi gas with strong short-range repulsive interactions does not undergo a ferromagnetic phase transition. National Science Foundation (U.S.), United States. Office of Naval Research, United States. Air Force Office of Scientific Research. Multidisciplinary University Research Initiative, United States. Army Research Office (grant no. W91NF-07-1-0493) United States. Defense Advanced Research Projects Agency. Optical Lattice Emulator Program 2012-08-30T16:11:00Z 2012-08-30T16:11:00Z 2012-06 2011-08 Article http://purl.org/eprint/type/JournalArticle 0031-9007 1079-7114 http://hdl.handle.net/1721.1/72471 Sanner, Christian et al. “Correlations and Pair Formation in a Repulsively Interacting Fermi Gas.” Physical Review Letters 108.24 (2012): 240404. © 2012 American Physical Society. https://orcid.org/0000-0002-9717-129X https://orcid.org/0000-0002-9528-3044 en_US http://dx.doi.org/10.1103/PhysRevLett.108.240404 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 |
| spellingShingle | Gillen, Jonathon Isaiah Huang, Wujie Ketterle, Wolfgang Keshet, Aviv Su, Edward Joseph Sanner, Christian Burkhard Correlations and Pair Formation in a Repulsively Interacting Fermi Gas |
| title | Correlations and Pair Formation in a Repulsively Interacting Fermi Gas |
| title_full | Correlations and Pair Formation in a Repulsively Interacting Fermi Gas |
| title_fullStr | Correlations and Pair Formation in a Repulsively Interacting Fermi Gas |
| title_full_unstemmed | Correlations and Pair Formation in a Repulsively Interacting Fermi Gas |
| title_short | Correlations and Pair Formation in a Repulsively Interacting Fermi Gas |
| title_sort | correlations and pair formation in a repulsively interacting fermi gas |
| url | http://hdl.handle.net/1721.1/72471 https://orcid.org/0000-0002-9717-129X https://orcid.org/0000-0002-9528-3044 |
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