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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 | 2010/09 |
| 形態種別 | 研究論文 |
| 標題 | Direct Evidence for the Dirac-Cone Topological Surface States in the Ternary Chalcogenide TlBiSe2 |
| 執筆形態 | その他 |
| 掲載誌名 | PHYSICAL REVIEW LETTERS |
| 出版社・発行元 | AMER PHYSICAL SOC |
| 巻・号・頁 | 105(13) |
| 著者・共著者 | Takafumi Sato,Kouji Segawa,Hua Guo,Katsuaki Sugawara,Seigo Souma,Takashi Takahashi,Yoichi Ando |
| 概要 | We have performed angle-resolved photoemission spectroscopy on TlBiSe2, which is a member of the ternary chalcogenides theoretically proposed as candidates for a new class of three-dimensional topological insulators. We found direct evidence for a nontrivial surface metallic state showing an "X"-shaped energy dispersion within the bulk-band gap. The present result unambiguously establishes that TlBiSe2 is a strong topological insulator with a single Dirac cone at the Brillouin-zone center. The observed bulk-band gap of 0.35 eV is the largest among known topological insulators, making TlBiSe2 the most promising material for studying room-temperature topological phenomena. |
| DOI | 10.1103/PhysRevLett.105.136802 |
| ISSN | 0031-9007 |
| PermalinkURL | https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=77957121442&origin=inward |