Observation of superfluidity in a strongly correlated two-dimensional Fermi gas

Understanding how strongly correlated two-dimensional (2D) systems can give rise to unconventional superconductivity with high critical temperatures is one of the major unsolved problems in condensed matter physics. Ultracold 2D Fermi gases have emerged as clean and controllable model systems to stu...

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Bibliographic Details
Published in:Science (American Association for the Advancement of Science) 2021-05, Vol.372 (6544), p.844-846
Main Authors: Sobirey, Lennart, Luick, Niclas, Bohlen, Markus, Biss, Hauke, Moritz, Henning, Lompe, Thomas
Format: Article
Language:English
Subjects:
Condensed matter physics
Critical velocity
Fermi gases
Fluids
Gases
Lithium
Motion
Perturbation
Superfluidity
Two dimensional models
Unconventional superconductivity
Velocity
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Summary:Understanding how strongly correlated two-dimensional (2D) systems can give rise to unconventional superconductivity with high critical temperatures is one of the major unsolved problems in condensed matter physics. Ultracold 2D Fermi gases have emerged as clean and controllable model systems to study the interplay of strong correlations and reduced dimensionality, but direct evidence of superfluidity in these systems has been missing. We demonstrate superfluidity in an ultracold 2D Fermi gas by moving a periodic potential through the system and observing no dissipation below a critical velocity We measure as a function of interaction strength and find a maximum in the crossover regime between bosonic and fermionic superfluidity. Our measurements enable systematic studies of the influence of reduced dimensionality on fermionic superfluidity.
ISSN:0036-8075
1095-9203
DOI:10.1126/science.abc8793