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
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
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