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arXiv · 1107.3285

Emergence of Orbital Angular Momentum by Inversion Symmetry Breaking and Its Detection by ARPES

Choong H. Kim·Jin-Hong Park·Jun Won Rhim·Beom Young Kim·Jaejun Yu·Masashi Arita·Kenya Shimada·Hirofumi Namatame·Masaki Taniguchi·Changyoung Kim·Jung Hoon Han
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Abstract

Rashba-split surface band is characterized by a one-to-one correspondence between the electron's momentum k and its spin orientation. Here we show that a similar correspondence between momentum and orbital angular momentum (OAM) must exist on surface bands once the inversion symmetry is broken. The correspondence is valid even when there is no spin-orbit interaction. Tight-binding and first-principles calculations are presented to support our claim. As a method to detect such OAM-momentum correspondence, we propose the circular dichroism (CD) experiment using the angle-resolved photoemission (ARPES) setup. CD-ARPES experiment performed on Cu surface confirms the existence of chiral OAM. A new concept of "orbital Galvanic effect" is proposed.

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Choong H. Kim, Jin-Hong Park, Jun Won Rhim, Beom Young Kim, Jaejun Yu, Masashi Arita, Kenya Shimada, Hirofumi Namatame, Masaki Taniguchi, Changyoung Kim, Jung Hoon Han. 2011-07-17. Emergence of Orbital Angular Momentum by Inversion Symmetry Breaking and Its Detection by ARPES. https://arxiv.org/abs/1107.3285

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