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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 | 2012/03 |
| 形態種別 | 研究論文 |
| 標題 | Topological Surface States in Lead-Based Ternary Telluride Pb(Bi1-xSbx)(2)Te-4 |
| 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 | 108(11) |
| 著者・共著者 | S. Souma,K. Eto,M. Nomura,K. Nakayama,T. Sato,T. Takahashi,Kouji Segawa,Yoichi Ando |
| 概要 | We have performed angle-resolved photoemission spectroscopy on Pb(Bi1-xSbx)(2)Te-4, which is a member of lead-based ternary tellurides and has been theoretically proposed as a candidate for a new class of three-dimensional topological insulators. In PbBi2Te4, we found a topological surface state with a hexagonally deformed Dirac-cone band dispersion, indicating that this material is a strong topological insulator with a single topological surface state at the Brillouin-zone center. Partial replacement of Bi with Sb causes a marked change in the Dirac carrier concentration, leading to the sign change of Dirac carriers from n type to p type. The Pb(Bi1-xSbx)(2)Te-4 system with tunable Dirac carriers thus provides a new platform for investigating exotic topological phenomena. |
| DOI | 10.1103/PhysRevLett.108.116801 |
| ISSN | 0031-9007 |
| PermalinkURL | https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=84863230210&origin=inward |