Topological proximity effect in a topological insulator hybrid

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

Research output: Contribution to journalArticle

28 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
Externally publishedYes

Fingerprint

Metals
insulators
Photoelectron Spectroscopy
Metallic films
Bismuth
Ultrathin films
Physics
Photoelectron spectroscopy
Wave functions
Cones
metals
bismuth
cones
photoelectric emission
routes
wave functions
physics
spectroscopy

ASJC Scopus subject areas

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

Cite this

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

Topological proximity effect in a topological insulator hybrid. / Shoman, T.; Takayama, Akari; Sato, T.; Souma, S.; Takahashi, T.; Oguchi, T.; Segawa, Kouji; Ando, Yoichi.

In: Nature Communications, Vol. 6, 6547, 12.03.2015.

Research output: Contribution to journalArticle

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, vol. 6, 6547. https://doi.org/10.1038/ncomms7547
Shoman, T. ; Takayama, Akari ; Sato, T. ; Souma, S. ; Takahashi, T. ; Oguchi, T. ; Segawa, Kouji ; Ando, Yoichi. / Topological proximity effect in a topological insulator hybrid. In: Nature Communications. 2015 ; Vol. 6.
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