π and 4π Josephson Effects Mediated by a Dirac Semimetal

dc.contributor.authorYu, W.
dc.contributor.authorPan, W.
dc.contributor.authorMedlin, D. L.
dc.contributor.authorRodriguez, M. A.
dc.contributor.authorLee, S. R.
dc.contributor.authorBao, Zhi-qiang
dc.contributor.authorZhang, Fan
dc.contributor.utdAuthorBao, Zhi-qiang
dc.contributor.utdAuthorZhang, Fan
dc.date.accessioned2019-05-16T20:55:16Z
dc.date.available2019-05-16T20:55:16Z
dc.date.created2018-04-27
dc.descriptionIncludes supplementary material
dc.description.abstractCd₃As₂ is a three-dimensional topological Dirac semimetal with connected Fermi-arc surface states. It has been suggested that topological superconductivity can be achieved in the nontrivial surface states of topological materials by utilizing the superconductor proximity effect. Here we report observations of both π and 4π periodic supercurrents in aluminum-Cd₃As₂-aluminum Josephson junctions. The π period is manifested by both the magnetic-field dependence of the critical supercurrent and the appearance of half-integer Shapiro steps in the ac Josephson effect. Our macroscopic theory suggests that the π period arises from interference between the induced bulk superconductivity and the induced Fermi-arc surface superconductivity. The 4π period is manifested by the missing first Shapiro steps and is expected for topological superconductivity.
dc.description.departmentSchool of Natural Sciences and Mathematics
dc.identifier.bibliographicCitationYu, W., W. Pan, D. L. Medlin, M. A. Rodriguez, et al. 2018. "π and 4π Josephson effects mediated by a Dirac semimetal." Physical Review Letters 120(17): art. 177704, doi:10.1103/PhysRevLett.120.177704
dc.identifier.issn0031-9007
dc.identifier.issue17
dc.identifier.urihttps://hdl.handle.net/10735.1/6501
dc.identifier.volume120
dc.language.isoen
dc.publisherAmer Physical Soc
dc.relation.urihttp://dx.doi.org/10.1103/PhysRevLett.120.177704
dc.rights©2018 American Physical Society
dc.source.journalPhysical Review Letters
dc.subjectCadmium arsenide
dc.subjectSuperconductors
dc.subjectNanowires
dc.subjectCrystals
dc.subjectSuperconducting quantum interference devices
dc.subjectPhysics
dc.titleπ and 4π Josephson Effects Mediated by a Dirac Semimetal
dc.type.genrearticle

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