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

H. Huang*, H. Toyama, L. V. Bondarenko, A. Y. Tupchaya, D. V. Gruznev, A. Takayama, R. Hobara, R. Akiyama, A. V. Zotov, A. A. Saranin, S. Hasegawa

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)


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.

Original languageEnglish
Article number075007
JournalSuperconductor Science and Technology
Issue number7
Publication statusPublished - 2020 Jul


  • Rashba effect
  • electrical transport
  • in situ measurement
  • superconductivity
  • superstructure
  • surface physics
  • two-dimensional system

ASJC Scopus subject areas

  • Ceramics and Composites
  • Condensed Matter Physics
  • Metals and Alloys
  • Electrical and Electronic Engineering
  • Materials Chemistry


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