Superconducting proximity effect in a Rashba-type surface state of Pb/Ge(111)

The Rashba superconductor, in which spin-splitting bands become superconducting, is fascinating as a novel superconducting system in low-dimensional systems. Here, we present the results of in-situ transport measurements on a Rashba-type surface state of the striped incommensurate (SIC) phase of a P...

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Bibliographic Details
Published in:Superconductor science & technology 2020-07, Vol.33 (7), p.75007
Main Authors: Huang, H, Toyama, H, Bondarenko, L V, Tupchaya, A Y, Gruznev, D V, Takayama, A, Hobara, R, Akiyama, R, Zotov, A V, Saranin, A A, Hasegawa, S
Format: Article
Language:English
Subjects:
electrical transport
measurement
Rashba effect
superconductivity
superstructure
surface physics
two-dimensional system
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Summary:The Rashba superconductor, in which spin-splitting bands become superconducting, is fascinating as a novel superconducting system in low-dimensional systems. Here, we present the results of in-situ transport measurements on a Rashba-type surface state of the striped incommensurate (SIC) phase of a Pb atomic layer on Ge(111) surface with additional Pb islands/clusters on it. We found that two-step superconducting transitions occurred at around 7 K and 3 K. The latter superconducting transition is suggested to be induced at the non-superconducting Rashba SIC area because of the lateral proximity effect caused by the superconducting Pb clusters. Our results propose a new type of Rashba superconductor, which is a platform to understand the Rashba superconducting systems.
ISSN:0953-2048
1361-6668
DOI:10.1088/1361-6668/ab8ffe