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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 | 2012/12 |
| 形態種別 | 研究論文 |
| 標題 | Manipulation of Topological States and the Bulk Band Gap Using Natural Heterostructures of a Topological Insulator |
| 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 | 109(23) |
| 著者・共著者 | K. Nakayama,K. Eto,Y. Tanaka,T. Sato,S. Souma,T. Takahashi,Kouji Segawa,Yoichi Ando |
| 概要 | We have performed angle-resolved photoemission spectroscopy on (PbSe)(5)(Bi2Se3)(3m), which forms a natural multilayer heterostructure consisting of a topological insulator and an ordinary insulator. For m = 2, we observed a gapped Dirac-cone state within the bulk band gap, suggesting that the topological interface states are effectively encapsulated by block layers; furthermore, it was found that the quantum confinement effect of the band dispersions of Bi2Se3 layers enhances the effective bulk band gap to 0.5 eV, the largest ever observed in topological insulators. For m = 1, the Dirac-like state is completely gone, suggesting the disappearance of the band inversion in the Bi2Se3 unit. These results demonstrate that utilization of naturally occurring heterostructures is a new promising strategy for manipulating the topological states and realizing exotic quantum phenomena. DOI: 10.1103/PhysRevLett.109.236804 |
| DOI | 10.1103/PhysRevLett.109.236804 |
| ISSN | 0031-9007 |
| PermalinkURL | https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=84870623672&origin=inward |