Chiral Orbital-Angular Momentum in the Surface States of Bi2Se3
Physical Review Letters 108 巻 4 号
046805- 頁
2012 発行
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| ファイル情報(添付) | |
| タイトル ( eng ) |
Chiral Orbital-Angular Momentum in the Surface States of Bi2Se3
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| 作成者 |
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
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| 収録物名 |
Physical Review Letters
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| 巻 | 108 |
| 号 | 4 |
| 開始ページ | 046805 |
| 抄録 |
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.
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| NDC分類 |
物理学 [ 420 ]
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| 言語 |
英語
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| 資源タイプ | 学術雑誌論文 |
| 出版者 |
American Physical Society
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| 発行日 | 2012 |
| 権利情報 |
(c) 2012 American Physical Society
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| 出版タイプ | Version of Record（出版社版。早期公開を含む） |
| アクセス権 | オープンアクセス |
| 収録物識別子 |
[ISSN] 0031-9007
[DOI] 10.1103/PhysRevLett.108.046805
[NCID] AA00773679
[DOI] http://dx.doi.org/10.1103/PhysRevLett.108.046805
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