Dimensional crossover in a strongly interacting ultracold atomic Fermi gas
| Autor: | Brendan C. Mulkerin, Hui Hu, Chris J. Vale, Xia-Ji Liu, Umberto Toniolo |
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| Rok vydání: | 2017 |
| Předmět: |
Condensed Matter::Quantum Gases
Physics Condensed matter physics Crossover FOS: Physical sciences Critical ionization velocity 01 natural sciences 010305 fluids & plasmas Superfluidity Quantum Gases (cond-mat.quant-gas) Quantum mechanics 0103 physical sciences Condensed Matter - Quantum Gases 010306 general physics Fermi gas Spectroscopy Fermi Gamma-ray Space Telescope |
| Zdroj: | Physical Review A. 96 |
| ISSN: | 2469-9934 2469-9926 |
| Popis: | We theoretically explore the crossover from three dimensions (3D) to two (2D) in a strongly interacting atomic Fermi superfluid through confining the transverse spatial dimension. Using the gaussian pair fluctuation theory, we determine the zero-temperature equation of state and Landau critical velocity as functions of the spatial extent of the transverse dimension and interaction strength. In the presence of strong interactions, we map out a dimensional crossover diagram from the location of maximum critical velocity, which exhibits distinct dependence on the transverse dimension from 2D to quasi-2D, and to 3D. We calculate the dynamic structure factor to characterize the low-energy excitations of the system and propose that the intermediate quasi-2D regime can be experimentally probed using Bragg spectroscopy. |
| Databáze: | OpenAIRE |
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