Superfluid density and critical velocity near the Berezinskii-Kosterlitz-Thouless transition in a two-dimensional strongly interacting Fermi gas
| Autor: | Brendan C. Mulkerin, Hui Hu, Paul Dyke, Chris J. Vale, Lianyi He, Xia-Ji Liu |
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| Rok vydání: | 2017 |
| Předmět: |
Condensed Matter::Quantum Gases
Physics Condensed matter physics Condensed Matter::Other Gaussian Critical ionization velocity 01 natural sciences 010305 fluids & plasmas Fermionic condensate Superfluidity symbols.namesake Kosterlitz–Thouless transition Phase (matter) 0103 physical sciences symbols 010306 general physics Fermi gas Superfluid helium-4 |
| Zdroj: | Physical Review A. 96 |
| ISSN: | 2469-9934 2469-9926 |
| Popis: | We theoretically investigate superfluidity in a strongly interacting Fermi gas confined to two dimensions at finite temperature. Using a Gaussian pair fluctuation theory in the superfluid phase, we calculate the superfluid density and determine the critical temperature and chemical potential at the Berezinskii-Kosterlitz-Thouless transition. We propose that the transition can be unambiguously demonstrated in cold-atom experiments by stirring the superfluid Fermi gas using a red-detuned laser beam, to identify the characteristic jump in the local Landau critical velocity at the superfluid-normal interface, as the laser beam moves across the cloud. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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