%0 Journal Article %T Detecting Chiral Orbital Angular Momentum by Circular Dichroism ARPES %A Jin-Hong Park %A Choong H. Kim %A Jun Won Rhim %A Jung Hoon Han %J Physics %D 2011 %I arXiv %R 10.1103/PhysRevB.85.195401 %X We show, by way of tight-binding and first-principles calculations, that a one-to-one correspondence between electron's crystal momentum k and non-zero orbital angular momentum (OAM) is a generic feature of surface bands. The OAM forms a chiral structure in momentum space much as its spin counterpart in Rashba model does, as a consequence of the inherent inversion symmetry breaking at the surface but not of spin-orbit interaction. Circular dichroism (CD) angle-resolved photoemission (ARPES) experiment is an efficient way to detect this new order, and we derive formulas explicitly relating the CD-ARPES signal to the existence of OAM in the band structure. The cases of degenerate p- and d-orbital bands are considered. %U http://arxiv.org/abs/1112.1821v1