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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 | 2013/04 |
| 形態種別 | 研究論文 |
| 標題 | Tunability of the k-space location of the Dirac cones in the topological crystalline insulator Pb1-xSnxTe |
| 執筆形態 | その他 |
| 掲載誌名 | PHYSICAL REVIEW B |
| 出版社・発行元 | AMER PHYSICAL SOC |
| 巻・号・頁 | 87(15) |
| 著者・共著者 | Y. Tanaka,T. Sato,K. Nakayama,S. Souma,T. Takahashi,Zhi Ren,M. Novak,Kouji Segawa,Yoichi Ando |
| 概要 | We have performed systematic angle-resolved photoemission spectroscopy of the topological crystalline insulator (TCI) Pb1-xSnxTe to elucidate the evolution of its electronic states across the topological phase transition. As previously reported, the band structure of SnTe (x = 1.0) measured on the (001) surface possesses a pair of Dirac-cone surface states located symmetrically across the (X) over bar point in the (110) mirror plane. Upon approaching the topological phase transition into the trivial phase at x(c) approximate to 0.25, we discovered that Dirac cones gradually move toward the (X) over bar point with its spectral weight gradually reduced with decreasing x. In samples with x <= 0.2, the Dirac-cone surface state is completely gone, confirming the occurrence of the topological phase transition. Also, the evolution of the valence band feature is found to be consistent with the bulk band inversion taking place at x(c). The tunability of the location of the Dirac cones in the Brillouin zone would be useful for applications requiring Fermi-surface matching with other materials, such as spin injection. DOI: 10.1103/PhysRevB.87.155105 |
| DOI | 10.1103/PhysRevB.87.155105 |
| ISSN | 1098-0121 |
| PermalinkURL | https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=84876162086&origin=inward |