|
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 |
| 形態種別 | 研究論文 |
| 査読 | 査読あり |
| 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 |
| 出版社・発行元 | AMER PHYSICAL SOC |
| 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)(2)Te-4 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)(2)Te-4, Bi2Te3, Bi2Se3, and TlBiSe2] and elucidated that the out-of-plane spin polarization P-z is systematically correlated with the warping strength. However, the magnitude of P-z 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. |
| DOI | 10.1103/PhysRevB.89.045134 |
| ISSN | 2469-9950/2469-9969 |