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ID 33913
本文ファイル
著者
Park, Seung Ryong
Han, Jinhee
Kim, Chul
Koh, Yoon Young
Kim, Changyoung
Lee, Hyungjun
Choi, Hyoung Joon
Han, Jung Hoon
Lee, Kyung Dong
Hur, Nam Jung
Arita, Masashi
NDC
物理学
抄録(英)
We performed angle-resolved photoemission (ARPES) experiments with circularly polarized light and first-principles density functional calculation with spin-orbit coupling to study surface states of a topological insulator Bi2Se3. We observed circular dichroism (CD) as large as 30% in the ARPES data with upper and lower Dirac cones showing opposite signs in CD. The observed CD is attributed to the existence of local orbital-angular momentum (OAM). First-principles calculation shows that OAM in the surface states is significant and is locked to the electron momentum in the opposite direction to the spin, forming chiral OAM states. Our finding opens a new possibility for strong light-induced spin-polarized current in surface states. We also provide a proof for local OAM origin of the CD in ARPES.
掲載誌名
Physical Review Letters
108巻
4号
開始ページ
046805
出版年月日
2012
出版者
American Physical Society
ISSN
0031-9007
NCID
出版者DOI
言語
英語
NII資源タイプ
学術雑誌論文
広大資料タイプ
学術雑誌論文
DCMIタイプ
text
フォーマット
application/pdf
著者版フラグ
publisher
権利情報
(c) 2012 American Physical Society
関連情報URL
部局名
放射光科学研究センター