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 | 2014/01/27 |
形態種別 | 研究論文 |
標題 | Relationship between Fermi surface warping and out-of-plane spin polarization in topological insulators: A view from spin- and angle-resolved photoemission |
執筆形態 | その他 |
掲載誌名 | Physical Review B - Condensed Matter and Materials Physics |
巻・号・頁 | 89(4) |
著者・共著者 | M. Nomura,S. Souma,A. Takayama,T. Sato,T. Takahashi,K. Eto,Kouji Segawa,Yoichi Ando |
概要 | We have performed spin- and angle-resolved photoemission spectroscopy of the topological insulator Pb(Bi,Sb)2Te4 and observed significant out-of-plane spin polarization on the hexagonally warped Dirac-cone surface state. To put this into context, we carried out quantitative analysis of the warping strengths for various topological insulators [Pb(Bi,Sb)2Te4, Bi2Te3, Bi2Se3, and TlBiSe2] and elucidated that the out-of-plane spin polarization Pz is systematically correlated with the warping strength. However, the magnitude of Pz is found to be only half that expected from the k·p theory when the warping is strong. Besides confirming a universal relationship between the spin polarization and the surface state structure, our data provide an empirical guiding principle for tuning the spin polarization in topological insulators. © 2014 American Physical Society. |
DOI | 10.1103/PhysRevB.89.045134 |
ISSN | 1098-0121 |
PermalinkURL | https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=84894642443&origin=inward |