Disentangling Pauli blocking of atomic decay from cooperative radiation and atomic motion in a 2D Fermi gas
| Autor: | Thomas Bilitewski, Asier Piñeiro Orioli, Christian Sanner, Lindsay Sonderhouse, Ross B. Hutson, Lingfeng Yan, William R. Milner, Jun Ye, Ana Maria Rey |
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| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: | |
| Popis: | The observation of Pauli blocking of atomic spontaneous decay via direct measurements of the atomic population requires the use of long-lived atomic gases where quantum statistics, atom recoil and cooperative radiative processes are all relevant. We develop a theoretical framework capable of simultaneously accounting for all these effects in a regime where prior theoretical approaches based on semi-classical non-interacting or interacting frozen atom approximations fail. We apply it to atoms in a single 2D pancake or arrays of pancakes featuring an effective $\Lambda$ level structure (one excited and two degenerate ground states). We identify a parameter window in which a factor of two extension in the atomic lifetime clearly attributable to Pauli blocking should be experimentally observable in deeply degenerate gases with $\sim 10^{3} $ atoms. Our predictions are supported by observation of a number-dependent excited state decay rate on the ${}^{1}\rm{S_0}-{}^{3}\rm{P_1}$ transition in $^{87}$Sr atoms. Comment: 6 + 6 pages, 4 + 1 figures. comments welcome |
| Databáze: | OpenAIRE |
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