| Autor: |
J. M. Midtgaard, Zhigang Wu, N. Goldman, G. M. Bruun |
| Jazyk: |
angličtina |
| Rok vydání: |
2020 |
| Předmět: |
|
| Zdroj: |
Physical Review Research, Vol 2, Iss 3, p 033385 (2020) |
| Druh dokumentu: |
article |
| ISSN: |
2643-1564 |
| DOI: |
10.1103/PhysRevResearch.2.033385 |
| Popis: |
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. |
| Databáze: |
Directory of Open Access Journals |
| Externí odkaz: |
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