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

Autor:	Murthy PA; Physics Institute, Heidelberg University, Heidelberg, Germany. murthy@physi.uni-heidelberg.de., Neidig M; Physics Institute, Heidelberg University, Heidelberg, Germany., Klemt R; Physics Institute, Heidelberg University, Heidelberg, Germany., Bayha L; Physics Institute, Heidelberg University, Heidelberg, Germany., Boettcher I; Department of Physics, Simon Fraser University, Burnaby, BC, Canada., Enss T; Institute for Theoretical Physics, Heidelberg University, Heidelberg, Germany., Holten M; Physics Institute, Heidelberg University, Heidelberg, Germany., Zürn G; Physics Institute, Heidelberg University, Heidelberg, Germany., Preiss PM; Physics Institute, Heidelberg University, Heidelberg, Germany., Jochim S; Physics Institute, Heidelberg University, Heidelberg, Germany.
Jazyk:	angličtina
Zdroj:	Science (New York, N.Y.) [Science] 2018 Jan 26; Vol. 359 (6374), pp. 452-455. Date of Electronic Publication: 2017 Dec 21.
DOI:	10.1126/science.aan5950
Abstrakt:	The nature of the normal phase of strongly correlated fermionic systems is an outstanding question in quantum many-body physics. We used spatially resolved radio-frequency spectroscopy to measure pairing energy of fermions across a wide range of temperatures and interaction strengths in a two-dimensional gas of ultracold fermionic atoms. We observed many-body pairing at temperatures far above the critical temperature for superfluidity. In the strongly interacting regime, the pairing energy in the normal phase considerably 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. Our findings show that pairing correlations in strongly interacting two-dimensional fermionic systems are remarkably robust against thermal fluctuations. (Copyright © 2018, The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works.)
Databáze:	MEDLINE
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