Eckel, S.
, Jendrzejewski, F.
, Kumar, A.
, Lobb, C.
and , G.
(2014),
Interferometric Measurement of the Current-Phase Relationship of a Superfluid Weak Link, Physical Review X, [online], https://dx.doi.org/10.1103/PhysRevX.4.031052, https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=916092
(Accessed December 21, 2024)
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Interferometric Measurement of the Current-Phase Relationship of a Superfluid Weak Link
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Author(s)
, , , ,
Abstract
Weak connections between superconductors or superfluids differ from classical links due to quantum coherence, which allows flow without resistance. Transport properties through such weak links can be described with a single function, the current-phase relationship, which serves as the quantum analog of the current-voltage relationship. Here, we present the first direct measurement of a current-phase relationship of a superfluid weak link. We interferometrically measure the phase gradient around a ring-shaped superfluid Bose-Einstein condensate containing a rotating weak link, allowing us to identify the current flowing around the ring. This technique can be extended to weak links in any phase-coherent quantum gas and can also measure current-phase relationships of excitations, such as solitonic-vortices. Such measurements may open new avenues of research in quantum transport.Citation
Physical Review X
Volume
4
Pub Type
Journals
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Keywords
atomtronics, Bose-Einstein condensation, current-phase relationships, interference, Jospehson junctions, superfluidity, ultracold atoms, weak links
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Created September 22, 2014, Updated May 3, 2021