Strongly correlated superfluid order parameters from dc Josephson supercurrents

doi:10.1126/science.aaz2463

GSTDTAP > 气候变化

DOI	10.1126/science.aaz2463
	Strongly correlated superfluid order parameters from dc Josephson supercurrents
	W. J. Kwon; G. Del Pace; R. Panza; M. Inguscio; W. Zwerger; M. Zaccanti; F. Scazza; G. Roati
	2020-07-03
发表期刊	Science
出版年	2020
英文摘要	In superconductors, electrons form a macroscopic wave function that has a definite phase. If two superconductors with different wave function phases are placed in contact with each other through an insulating link, a current will flow through this so-called Josephson's junction without any external voltage. Luick et al. and Kwon et al. observed an analogous phenomenon in a setup that involved two reservoirs of superfluid Fermi gases. Both groups measured the so-called current-phase relation: the dependence of the magnitude of the current on the relative phase. By tuning an external magnetic field, they were able to study how the interactions between fermions affected the nature of the superfluid state. Science , this issue p. [89][1], p. [84][2] The direct-current (dc) Josephson effect provides a phase-sensitive tool for investigating superfluid order parameters. We report on the observation of dc Josephson supercurrents in strongly interacting fermionic superfluids across a tunneling barrier in the absence of any applied potential difference. For sufficiently strong barriers, we observed a sinusoidal current-phase relation, in agreement with Josephson’s seminal prediction. We mapped out the zero-resistance state and its breakdown as a function of junction parameters, extracting the Josephson critical current behavior. By comparing our results with an analytic model, we determined the pair condensate fraction throughout the Bardeen-Cooper-Schrieffer–Bose-Einstein condensation crossover. Our work suggests that coherent Josephson transport may be used to pin down superfluid order parameters in diverse atomic systems, even in the presence of strong correlations. [1]: /lookup/doi/10.1126/science.aaz2342 [2]: /lookup/doi/10.1126/science.aaz2463
领域	气候变化 ; 资源环境
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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/281887
专题	气候变化资源环境科学
推荐引用方式 GB/T 7714	W. J. Kwon,G. Del Pace,R. Panza,et al. Strongly correlated superfluid order parameters from dc Josephson supercurrents[J]. Science,2020.
APA	W. J. Kwon.,G. Del Pace.,R. Panza.,M. Inguscio.,W. Zwerger.,...&G. Roati.(2020).Strongly correlated superfluid order parameters from dc Josephson supercurrents.Science.
MLA	W. J. Kwon,et al."Strongly correlated superfluid order parameters from dc Josephson supercurrents".Science (2020).