Topological proximity effect in a topological insulator hybrid

T. Shoman, A. Takayama, T. Sato, S. Souma, T. Takahashi, T. Oguchi, Kouji Segawa, Yoichi Ando

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31 Citations (Scopus)

Abstract

It is well known that a topologically protected gapless state appears at an interface between a topological insulator and an ordinary insulator; however, the physics of the interface between a topological insulator and a metal has largely been left unexplored. Here we report a novel phenomenon termed topological proximity effect, which occurs between a metallic ultrathin film and a three-dimensional topological insulator. We study one bilayer of bismuth metal grown on the three-dimensional topological insulator material TlBiSe2, and by using spin- and angle-resolved photoemission spectroscopy, we found evidence that the topological Dirac-cone state migrates from the surface of TlBiSe2 to the attached one-bilayer Bi. We show that such a migration of the topological state occurs as a result of strong spin-dependent hybridization of the wave functions at the interface, which is also supported by our first-principles calculations. This discovery points to a new route to manipulating the topological properties of materials.

Original languageEnglish
Article number6547
JournalNature communications
Volume6
DOIs
Publication statusPublished - 2015 Mar 12

ASJC Scopus subject areas

  • Chemistry(all)
  • Biochemistry, Genetics and Molecular Biology(all)
  • Physics and Astronomy(all)

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    Shoman, T., Takayama, A., Sato, T., Souma, S., Takahashi, T., Oguchi, T., Segawa, K., & Ando, Y. (2015). Topological proximity effect in a topological insulator hybrid. Nature communications, 6, [6547]. https://doi.org/10.1038/ncomms7547