Two-Dimensional Superconductor with a Giant Rashba Effect: One-Atom-Layer Tl-Pb Compound on Si(111)

A. V. Matetskiy, S. Ichinokura, L. V. Bondarenko, A. Y. Tupchaya, D. V. Gruznev, A. V. Zotov, A. A. Saranin, R. Hobara, Akari Takayama, S. Hasegawa

Research output: Contribution to journalArticle

52 Citations (Scopus)

Abstract

A one-atom-layer compound made of one monolayer of Tl and one-third monolayer of Pb on a Si(111) surface having 3×3 periodicity was found to exhibit a giant Rashba-type spin splitting of metallic surface-state bands together with two-dimensional superconducting transport properties. Temperature-dependent angle-resolved photoelectron spectroscopy revealed an enhanced electron-phonon coupling for one of the spin-split bands. In situ micro-four-point-probe conductivity measurements with and without magnetic field demonstrated that the (Tl, Pb)/Si(111) system transformed into the superconducting state at 2.25 K, followed by the Berezinskii-Kosterlitz-Thouless mechanism. The 2D Tl-Pb compound on Si(111) is believed to be the prototypical object for prospective studies of intriguing properties of the superconducting 2D system with lifted spin degeneracy, bearing in mind that its composition, atomic and electron band structures, and spin texture are already well established.

Original languageEnglish
Article number147003
JournalPhysical Review Letters
Volume115
Issue number14
DOIs
Publication statusPublished - 2015 Oct 2
Externally publishedYes

    Fingerprint

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Matetskiy, A. V., Ichinokura, S., Bondarenko, L. V., Tupchaya, A. Y., Gruznev, D. V., Zotov, A. V., Saranin, A. A., Hobara, R., Takayama, A., & Hasegawa, S. (2015). Two-Dimensional Superconductor with a Giant Rashba Effect: One-Atom-Layer Tl-Pb Compound on Si(111). Physical Review Letters, 115(14), [147003]. https://doi.org/10.1103/PhysRevLett.115.147003