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.
journal_name
Nat Communjournal_title
Nature communicationsauthors
Shoman T,Takayama A,Sato T,Souma S,Takahashi T,Oguchi T,Segawa K,Ando Ydoi
10.1038/ncomms7547subject
Has Abstractpub_date
2015-03-12 00:00:00pages
6547issn
2041-1723pii
ncomms7547journal_volume
6pub_type
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