期刊
NATURE COMMUNICATIONS
卷 6, 期 -, 页码 -出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/ncomms7547
关键词
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资金
- JSPS (KAKENHI) [23224010, 24654096, 25287079, 25220708]
- MEXT of Japan (Innovative Area 'Topological Quantum Phenomena')
- AFOSR (AOARD) [124038]
- Mitsubishi Foundation, UVSOR [24-536]
- KEK PF [2012S2 001]
- Grants-in-Aid for Scientific Research [24654096, 23224010, 22103001, 25103701, 26287071, 25287079, 22103004] Funding Source: KAKEN
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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