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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 | Spin Polarization of Gapped Dirac Surface States Near the Topological Phase Transition in TlBi(S1-xSex)(2) |
| 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(18) |
| 著者・共著者 | S. Souma,M. Komatsu,M. Nomura,T. Sato,A. Takayama,T. Takahashi,K. Eto,Kouji Segawa,Yoichi Ando |
| 概要 | We performed systematic spin- and angle-resolved photoemission spectroscopy of TlBi(S1-xSex)(2) which undergoes a topological phase transition at x similar to 0.5. In TlBiSe2 (x = 1.0), we revealed a helical spin texture of Dirac-cone surface states with an intrinsic in-plane spin polarization of similar to 0.8. The spin polarization still survives in the gapped surface states at x > 0: 5, although it gradually weakens upon approaching x = 0.5 and vanishes in the nontopological phase. No evidence for the out-of-plane spin polarization was found, irrespective of x and momentum. The present results unambiguously indicate the topological origin of the gapped Dirac surface states, and also impose a constraint on models to explain the origin of mass acquisition of Dirac fermions. |
| DOI | 10.1103/PhysRevLett.109.186804 |
| ISSN | 0031-9007/1079-7114 |
| PermalinkURL | https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=84868325991&origin=inward |