π and 4π Josephson Effects Mediated by a Dirac Semimetal

Cd_{3}As_{2} 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...

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Bibliographic Details
Published in:Physical review letters 2018-04, Vol.120 (17), p.177704-177704, Article 177704
Main Authors: Yu, W, Pan, W, Medlin, D L, Rodriguez, M A, Lee, S R, Bao, Zhi-Qiang, Zhang, F
Format: Article
Language:English
Subjects:
Aluminum
Dependence
Josephson effect
Josephson junctions
Proximity effect (electricity)
Superconductivity
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Summary:Cd_{3}As_{2} 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-Cd_{3}As_{2}-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.
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.120.177704