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ID 33903
file
creator
Jung, Wonsig
Kim, Yeongkwan
Kim, Beomyoung
Koh, Yoonyoung
Kim, Chul
Matsunami, Masaharu
Kimura, Shin-ichi
Arita, Masashi
Han, Jung Hoon
Kim, Juyoung
Cho, Beongki
Kim, Changyoung
NDC
Physics
abstract
We performed angle-resolved photoemission (ARPES) experiments on Bi2Te3 with circularly polarized light. ARPES data show very strong circular dichroism, indicating the existence of orbital angular momentum (OAM). Moreover, the alignment of OAM is found to have a strong binding energy dependence. Such energy dependence comes from a relatively strong band warping effect in Bi2Te3 compared to Bi2Se3. OAM close to the Dirac point has an ideal chiral structure (sinθ) without an out-of-plane component. The warping effect comes in as the binding energy decreases, and circular dichroism along a constant energy contour can no longer be explained by a simple sinθ function but requires a sin3θ term. When the warping effect becomes even stronger near the Fermi energy, circular dichroism gains an additional sin6θ term. Such behavior is found to be compatible with the theoretically predicted OAM structure.
journal title
Physical Review B
volume
Volume 84
issue
Issue 24
start page
245435
date of issued
2011
publisher
American Physical Society
issn
1098-0121
ncid
publisher doi
language
eng
nii type
Journal Article
HU type
Journal Articles
DCMI type
text
format
application/pdf
text version
publisher
rights
(c) 2011 American Physical Society
relation url
department
Hiroshima Synchrotron Radiation Center