Anomalous breaking of scale invariance in a two-dimensional fermi gas
The frequency of the breathing mode of a two-dimensional Fermi gas with zero-range interactions in a harmonic confinement is fixed by the scale invariance of the Hamiltonian. Scale invariance is broken in the quantized theory by introducing the two-dimensional scattering length as a regulator. This...
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| Main Authors: | , , , , , |
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| Format: | Article (Journal) |
| Language: | English |
| Published: |
17 September 2018
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| In: |
Physical review letters
Year: 2018, Volume: 121, Issue: 12, Pages: 1-6 |
| ISSN: | 1079-7114 |
| DOI: | 10.1103/PhysRevLett.121.120401 |
| Online Access: | Verlag, Volltext: https://doi.org/10.1103/PhysRevLett.121.120401 Verlag, Volltext: https://link.aps.org/doi/10.1103/PhysRevLett.121.120401 
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| Author Notes: | M. Holten, L. Bayha, A.C. Klein, P.A. Murthy, P.M. Preiss, and S. Jochim |
| Summary: | The frequency of the breathing mode of a two-dimensional Fermi gas with zero-range interactions in a harmonic confinement is fixed by the scale invariance of the Hamiltonian. Scale invariance is broken in the quantized theory by introducing the two-dimensional scattering length as a regulator. This is an example of a quantum anomaly in the field of ultracold atoms and leads to a shift of the frequency of the collective breathing mode of the cloud. In this work, we study this anomalous frequency shift for a two-component Fermi gas in the strongly interacting regime. We measure significant upwards shifts away from the scale-invariant result that show a strong interaction dependence. This observation implies that scale invariance is broken anomalously in the strongly interacting two-dimensional Fermi gas. |
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| Item Description: | Gesehen am 19.11.2019 |
| Physical Description: | Online Resource |
| ISSN: | 1079-7114 |
| DOI: | 10.1103/PhysRevLett.121.120401 |