Chiral Orbital-Angular Momentum in the Surface States of Bi2Se3

被引：144

作者：

Park, Seung Ryong ^{[1
]}

Han, Jinhee ^{[1
]}

Kim, Chul ^{[1
]}

Koh, Yoon Young ^{[1
]}

Kim, Changyoung ^{[1
]}

Lee, Hyungjun ^{[1
]}

Choi, Hyoung Joon ^{[1
]}

Han, Jung Hoon ^{[2
,3
]}

Lee, Kyung Dong ^{[4
]}

Hur, Nam Jung ^{[4
]}

Arita, Masashi ^{[5
]}

Shimada, Kenya ^{[5
]}

Namatame, Hirofumi ^{[5
]}

Taniguchi, Masaki ^{[5
]}

机构：

[1] Yonsei Univ, Inst Phys & Appl Phys, Seoul 120749, South Korea

[2] Sungkyunkwan Univ, Dept Phys, Suwon 440746, South Korea

[3] Sungkyunkwan Univ, Phys Res Div BK21, Suwon 440746, South Korea

[4] Inha Univ, Dept Phys, Inchon 402751, South Korea

[5] Hiroshima Univ, Hiroshima Synchrotron Radiat Ctr, Hiroshima 7390046, Japan

来源：

PHYSICAL REVIEW LETTERS | 2012年 / 108卷 / 04期

关键词：

SINGLE DIRAC CONE; TOPOLOGICAL-INSULATOR; ELECTRONIC-STRUCTURE; CIRCULAR-DICHROISM; BI2TE3; MOLECULES;

D O I：

10.1103/PhysRevLett.108.046805

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

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.

引用

页数：5

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