Emergence of Orbital Angular Momentum by Inversion Symmetry Breaking and   Its Detection by ARPES
  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. 
Choong H. Kim, Jin-Hong Park, Jun Won Rhim, Beom Young Kim, Jaejun Yu,   Masashi Arita, Kenya Shimada, Hirofumi Namatame, Ma...
cond-mat.mtrl-sci