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

doi:10.1126/science.abc8793

GSTDTAP > 气候变化

DOI	10.1126/science.abc8793
	Observation of superfluidity in a strongly correlated two-dimensional Fermi gas
	Lennart Sobirey; Niclas Luick; Markus Bohlen; Hauke Biss; Henning Moritz; Thomas Lompe
	2021-05-21
发表期刊	Science
出版年	2021
英文摘要	A superfluid can flow without viscosity but only if the speed of the flow is lower than the so-called critical velocity. Sobirey et al. measured the critical velocity of a system of ultracold fermionic atoms confined to two dimensions. The researchers trapped a gas of lithium-6 atoms in a box-shaped potential and then moved another, periodic potential through the trap. The response of the gas to this perturbation showed a sudden increase when the speed of the periodic potential reached the critical velocity. Science , abc8793, this issue p. [844][1] 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 v c. We measure v c 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. [1]: /lookup/doi/10.1126/science.abc8793
领域	气候变化 ; 资源环境
URL	查看原文
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文献类型	期刊论文
条目标识符	http://119.78.100.173/C666/handle/2XK7JSWQ/328828
专题	气候变化资源环境科学
推荐引用方式 GB/T 7714	Lennart Sobirey,Niclas Luick,Markus Bohlen,et al. Observation of superfluidity in a strongly correlated two-dimensional Fermi gas[J]. Science,2021.
APA	Lennart Sobirey,Niclas Luick,Markus Bohlen,Hauke Biss,Henning Moritz,&Thomas Lompe.(2021).Observation of superfluidity in a strongly correlated two-dimensional Fermi gas.Science.
MLA	Lennart Sobirey,et al."Observation of superfluidity in a strongly correlated two-dimensional Fermi gas".Science (2021).