2011/12/08 by Jin‐Hong Park, Jin-Hong Park, Choong H. Kim +3 · 127 citations
Chemistry · Physics and Astronomy · #Angle-resolved photoemission spectroscopy #Angular momentum #Chemistry #Circular dichroism #Condensed matter physics #Crystallography #Degenerate energy levels #Electron #Electronic band structure #Electronic structure #Geometry #Magnetic properties of thin films #Photoemission spectroscopy #Physics #Point reflection #Position and momentum space #Quantum and electron transport phenomena #Quantum mechanics #Spectral line #Spin (aerodynamics) #Spin–orbit interaction #Symmetry (geometry) #Topological Materials and Phenomena #cond-mat.mtrl-sci
paper · pdf · doi:10.1103/physrevb.85.195401
published in Physical Review B 85(19) (American Physical Society) · 5 pages, 1 figure
arxiv created 2011/12/08 · openalex publication_date 2012/05/02 · arxiv updated 2013/05/29 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
We show, by way of tight-binding and first-principles calculations, that a one-to-one correspondence between an electron's crystal momentum k and nonzero 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. This is the orbital counterpart of conventional Rashba effect and may be called the ``orbital Rashba effect.'' The circular dichroism (CD) angle-resolved photoemission (ARPES) method 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.