Disentangling Pauli blocking of atomic decay from cooperative radiation and atomic motion in a 2D Fermi gas

Published on Aug 5, 2021in arXiv: Quantum Gases
Thomas Bilitewski8
Estimated H-index: 8
,
Asier Piñeiro Orioli6
Estimated H-index: 6
+ 6 AuthorsAna Maria Rey62
Estimated H-index: 62
(NIST: National Institute of Standards and Technology)
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Abstract
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 \Lambdalevel 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}r atoms.
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