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ID 33907
本文ファイル
著者
Kim, Beomyoung
Kim, Choong H.
Kim, Panjin
Jung, Wonsig
Kim, Yeongkwan
Koh, Yoonyoung
Arita, Masashi
Yu, Jaejun
Kim, Changyoung
NDC
物理学
抄録(英)
We performed angle-resolved photoemission studies on Cu(111) and Au(111) surface states with circularly polarized light to investigate local orbital angular momentum (OAM) structures. Existence of OAM is confirmed, as predicted, to exist in systems with an inversion symmetry breaking. Cu(111) surface state bands are found to have chiral OAM in spite of very small spin-orbit coupling, consistent with the theoretical prediction. As for Au(111), we observe split bands for which OAM for the inner and outer bands are parallel, unlike the Bi2Se3 case. We also performed first-principles calculations and the results are found to be consistent with experimental results. Moreover, the majority of OAM is found to have d-orbital origin while a small contribution comes from p orbitals. An effective Hamiltonian that incorporates the role of OAM is derived and is used to extract the spin and OAM structures. We discuss the evolution of angular momentum structures from a pure OAM system to a strongly spin-orbit-entangled state. We predict that the transition occurs through a reversal of the OAM direction at a k point in the inner band if the system has a proper spin-orbit coupling strength.
掲載誌名
Physical Review B
85巻
19号
開始ページ
195402
出版年月日
2012
出版者
American Physical Society
ISSN
1098-0121
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



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