High temperature pairing in a strongly interacting two-dimensional Fermi gas

We observe many-body pairing in a two-dimensional gas of ultracold fermionic atoms at temperatures far above the critical temperature for superfluidity. For this, we use spatially resolved radio-frequency spectroscopy to measure pairing energies spanning a wide range of temperatures and interaction...

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Bibliographic Details
Published in:arXiv.org 2017-05
Main Authors: Murthy, Puneet A, Neidig, Mathias, Klemt, Ralf, Bayha, Luca, Boettcher, Igor, Enss, Tilman, Holten, Marvin, Zürn, Gerhard, Preiss, Philipp M, Jochim, Selim
Format: Article
Language:English
Subjects:
Critical temperature
Dependence
Fermions
High temperature
Superfluidity
Temperature
Two dimensional bodies
Variations
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Summary:We observe many-body pairing in a two-dimensional gas of ultracold fermionic atoms at temperatures far above the critical temperature for superfluidity. For this, we use spatially resolved radio-frequency spectroscopy to measure pairing energies spanning a wide range of temperatures and interaction strengths. In the strongly interacting regime where the scattering length between fermions is on the same order as the inter-particle spacing, the pairing energy in the normal phase significantly exceeds the intrinsic two-body binding energy of the system and shows a clear dependence on local density. This implies that pairing in this regime is driven by many-body correlations, rather than two-body physics. We find this effect to persist at temperatures close to the Fermi temperature which demonstrates that pairing correlations in strongly interacting two-dimensional fermionic systems are remarkably robust against thermal fluctuations.
ISSN:2331-8422
DOI:10.48550/arxiv.1705.10577