Detecting chiral pairing and topological superfluidity using circular dichroism
Realizing and probing topological superfluids is a key goal for fundamental science, with exciting technological promises. Here, we show that chiral p_{x}+ip_{y} pairing in a two-dimensional topological superfluid can be detected through circular dichroism, namely, as a difference in the excitation...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
| Published: |
American Physical Society
2020-09-01
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| Series: | Physical Review Research |
| Online Access: | http://doi.org/10.1103/PhysRevResearch.2.033385 |
| _version_ | 1797211301696503808 |
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| author | J. M. Midtgaard Zhigang Wu N. Goldman G. M. Bruun |
| author_facet | J. M. Midtgaard Zhigang Wu N. Goldman G. M. Bruun |
| author_sort | J. M. Midtgaard |
| collection | DOAJ |
| description | Realizing and probing topological superfluids is a key goal for fundamental science, with exciting technological promises. Here, we show that chiral p_{x}+ip_{y} pairing in a two-dimensional topological superfluid can be detected through circular dichroism, namely, as a difference in the excitation rates induced by a clockwise and counterclockwise circular drive. For weak pairing, this difference is to a very good approximation determined by the Chern number of the superfluid, whereas there is a nontopological contribution scaling as the superfluid gap squared that becomes significant for stronger pairing. This gives rise to a competition between the experimentally driven goal to maximize the critical temperature of the superfluid, and observing a signal given by the underlying topology. Using a combination of strong-coupling Eliashberg and Berezinskii-Kosterlitz-Thouless theory, we analyze this tension for an atomic Bose-Fermi gas, which represents a promising platform for realizing a chiral superfluid. We identify a wide range of system parameters where both the critical temperature is high and the topological contribution to the dichroic signal is dominant. |
| first_indexed | 2024-04-24T10:24:19Z |
| format | Article |
| id | doaj.art-e4f8b97c3a7a4776b579029f79866e31 |
| institution | Directory Open Access Journal |
| issn | 2643-1564 |
| language | English |
| last_indexed | 2024-04-24T10:24:19Z |
| publishDate | 2020-09-01 |
| publisher | American Physical Society |
| record_format | Article |
| series | Physical Review Research |
| spelling | doaj.art-e4f8b97c3a7a4776b579029f79866e312024-04-12T17:00:16ZengAmerican Physical SocietyPhysical Review Research2643-15642020-09-012303338510.1103/PhysRevResearch.2.033385Detecting chiral pairing and topological superfluidity using circular dichroismJ. M. MidtgaardZhigang WuN. GoldmanG. M. BruunRealizing and probing topological superfluids is a key goal for fundamental science, with exciting technological promises. Here, we show that chiral p_{x}+ip_{y} pairing in a two-dimensional topological superfluid can be detected through circular dichroism, namely, as a difference in the excitation rates induced by a clockwise and counterclockwise circular drive. For weak pairing, this difference is to a very good approximation determined by the Chern number of the superfluid, whereas there is a nontopological contribution scaling as the superfluid gap squared that becomes significant for stronger pairing. This gives rise to a competition between the experimentally driven goal to maximize the critical temperature of the superfluid, and observing a signal given by the underlying topology. Using a combination of strong-coupling Eliashberg and Berezinskii-Kosterlitz-Thouless theory, we analyze this tension for an atomic Bose-Fermi gas, which represents a promising platform for realizing a chiral superfluid. We identify a wide range of system parameters where both the critical temperature is high and the topological contribution to the dichroic signal is dominant.http://doi.org/10.1103/PhysRevResearch.2.033385 |
| spellingShingle | J. M. Midtgaard Zhigang Wu N. Goldman G. M. Bruun Detecting chiral pairing and topological superfluidity using circular dichroism Physical Review Research |
| title | Detecting chiral pairing and topological superfluidity using circular dichroism |
| title_full | Detecting chiral pairing and topological superfluidity using circular dichroism |
| title_fullStr | Detecting chiral pairing and topological superfluidity using circular dichroism |
| title_full_unstemmed | Detecting chiral pairing and topological superfluidity using circular dichroism |
| title_short | Detecting chiral pairing and topological superfluidity using circular dichroism |
| title_sort | detecting chiral pairing and topological superfluidity using circular dichroism |
| url | http://doi.org/10.1103/PhysRevResearch.2.033385 |
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