Emergence of Orbital Angular Momentum by Inversion Symmetry Breaking and Its Detection by ARPES
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.
Keywords
Cite
@article{arxiv.1107.3285,
title = {Emergence of Orbital Angular Momentum by Inversion Symmetry Breaking and Its Detection by ARPES},
author = {Choong H. Kim and Jin-Hong Park and Jun Won Rhim and Beom Young Kim and Jaejun Yu and Masashi Arita and Kenya Shimada and Hirofumi Namatame and Masaki Taniguchi and Changyoung Kim and Jung Hoon Han},
journal= {arXiv preprint arXiv:1107.3285},
year = {2011}
}
Comments
5 pages, 2 figures, ARPES experiment on Cu included; author list updated, This version will not be published. A newer version, which is submitted, is available at arXiv:1112.1821