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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 | 2012/11 |
| 形態種別 | 研究論文 |
| 標題 | Experimental realization of a topological crystalline insulator in SnTe |
| 執筆形態 | その他 |
| 掲載誌名 | NATURE PHYSICS |
| 出版社・発行元 | NATURE PUBLISHING GROUP |
| 巻・号・頁 | 8(11),pp.800-803 |
| 著者・共著者 | Y. Tanaka,Zhi Ren,T. Sato,K. Nakayama,S. Souma,T. Takahashi,Kouji Segawa,Yoichi Ando |
| 概要 | A topological insulator is an unusual quantum state of matter, characterized by the appearance, at its edges or on its surface, of a gapless metallic state that is protected by time-reversal symmetry(1,2). The discovery of topological insulators has stimulated the search for other topological states protected by other symmetries(3-7), such as the recently predicted(8) topological crystalline insulator (TCI) in which the metallic surface states are protected by the mirror symmetry of the crystal. Here we present experimental evidence for the TCI phase in tin telluride (SnTe), which has been predicted to be a TCI (ref. 9). Our angle-resolved photoemission spectra show the signature of a metallic Dirac-cone surface band, with its Dirac point slightly away from the edge of the surface Brillouin zone in SnTe. Such a gapless surface state is absent in a cousin material, lead telluride, in line with the theoretical prediction. |
| DOI | 10.1038/NPHYS2442 |
| ISSN | 1745-2473 |
| PermalinkURL | https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=84868681541&origin=inward |