Giant Rashba system on a semiconductor substrate with tunable Fermi level: Bi/GaSb(110)(2×1)

Takuto Nakamura, Yoshiyuki Ohtsubo, Naoki Tokumasu, Patrick Le Fèvre, François Bertran, Shin-ichiro Ideta, Kiyohisa Tanaka, Kenta Kuroda, Koichiro Yaji, Ayumi Harasawa, Shik Shin, Fumio Komori, and Shin-ichi Kimura
Phys. Rev. Materials 3, 126001 – Published 2 December 2019

Abstract

We fabricated spin-polarized surface electronic states with tunable Fermi levels from a semiconductor to low-dimensional metal in the Bi/GaSb(110)-(2×1) surface using angle-resolved photoelectron spectroscopy (ARPES) and spin-resolved ARPES. The spin-polarized surface band of Bi/GaSb(110) exhibits quasi-one-dimensional character with the Rashba parameter αR of 4.1 and 2.6 eVÅ at the Γ¯ and Y¯ points of the surface Brillouin zone, respectively. The Fermi level of the surface electronic state is tuned in situ by element-selective Ar-ion sputtering on the GaSb substrate. The giant Rashba-type spin splitting with switchable metallic/semiconducting character on a semiconductor substrate makes this system a promising candidate for future research in low-dimensional spintronic phenomena.

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  • Received 29 September 2019

DOI:https://doi.org/10.1103/PhysRevMaterials.3.126001

©2019 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Takuto Nakamura1, Yoshiyuki Ohtsubo1,2,*, Naoki Tokumasu1, Patrick Le Fèvre3, François Bertran3, Shin-ichiro Ideta4, Kiyohisa Tanaka4, Kenta Kuroda5, Koichiro Yaji5, Ayumi Harasawa5, Shik Shin5, Fumio Komori5, and Shin-ichi Kimura1,2,†

  • 1Department of Physics, Graduate School of Science, Osaka University, Toyonaka 560-0043, Japan
  • 2Graduate School of Frontier Biosciences, Osaka University, Suita 565-0871, Japan
  • 3Synchrotron SOLEIL, Saint-Aubin-BP 48, F-91192 Gif sur Yvette, France
  • 4Institute for Molecular Science, Okazaki 444-8585, Japan
  • 5Institute for Solid State Physics, The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8581, Japan

  • *y_oh@fbs.osaka-u.ac.jp
  • kimura@fbs.osaka-u.ac.jp

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Issue

Vol. 3, Iss. 12 — December 2019

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