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セガワ コウジ
SEGAWA KOJI
瀬川 耕司 所属 京都産業大学 理学部 物理科学科 職種 教授 |
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| 言語種別 | 英語 |
| 発行・発表の年月 | 2015/03 |
| 形態種別 | 研究論文 |
| 標題 | Topological proximity effect in a topological insulator hybrid |
| 執筆形態 | その他 |
| 掲載誌名 | NATURE COMMUNICATIONS |
| 出版社・発行元 | NATURE PUBLISHING GROUP |
| 巻・号・頁 | 6 |
| 著者・共著者 | T. Shoman,A. Takayama,T. Sato,S. Souma,T. Takahashi,T. Oguchi,Kouji Segawa,Yoichi Ando |
| 概要 | 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. |
| DOI | 10.1038/ncomms7547 |
| ISSN | 2041-1723 |
| PermalinkURL | https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=84924560305&origin=inward |