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ID 33913
file
creator
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
Physics
abstract
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.
journal title
Physical Review Letters
volume
Volume 108
issue
Issue 4
start page
046805
date of issued
2012
publisher
American Physical Society
issn
0031-9007
ncid
publisher doi
language
eng
nii type
Journal Article
HU type
Journal Articles
DCMI type
text
format
application/pdf
text version
publisher
rights
(c) 2012 American Physical Society
relation url
department
Hiroshima Synchrotron Radiation Center



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