Topological proximity effect in a topological insulator hybrid

Nature Communications
T ShomanYoichi Ando

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.

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Citations

Apr 5, 2018·Nature Communications·Mingsen PanLiang Feng
Jul 21, 2016·Nature Communications·N OgawaY Tokura
Mar 30, 2017·Journal of Physics. Condensed Matter : an Institute of Physics Journal·Abhishek BanerjeeP S Anil Kumar
Sep 5, 2020·Scientific Reports·K HoltgreweC Carbone
Mar 12, 2016·Physical Review Letters·Timothy H HsiehTaylor L Hughes
Aug 22, 2017·ACS Nano·Sung Hwan KimHan Woong Yeom
Aug 29, 2019·ACS Omega·Marcio CostaAdalberto Fazzio
Aug 27, 2021·ACS Nano·Shu Hsuan SuJung-Chun Andrew Huang
Oct 29, 2021·Nano Letters·Lin XiongD N Basov

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