AVS 49th International Symposium
    Surface Science Thursday Sessions
       Session SS-ThM

Paper SS-ThM8
Spin-Resolved Photoemission of Surface States in H on W(110)

Thursday, November 7, 2002, 10:40 am, Room C-108

Session: Electronic Structure and Stimulated Processes
Presenter: E. Rotenberg, Lawrence Berkeley National Laboratory
Authors: E. Rotenberg, Lawrence Berkeley National Laboratory
M. Hochstrasser, Lawrence Livermore National Laboratory
J.G. Tobin, Lawrence Livermore National Laboratory
S.D. Kevan, University of Oregon
Correspondent: Click to Email
Surface states of metals can be split due to the spin-orbit-coupling (SOC) interaction, as first shown experimentally by LaShell et al for Au(111) surface states.@footnote 1@ Their conjecture was that the surface states could be split by SOC when the bulk inversion symmetry was broken at the vacuum/metal interface. Later we found a similar splitting for W(110) and Mo(110) surfaces and furthermore that this splitting could be enhanced with hydrogen or alkali metal adsorption.@footnote 2@ In the present work, the hydrogenated surface electronic states on W(110) have been measured using spin-resolved photoemission. The origin of the splitting is confirmed to be spin-orbit-coupling. In confirmation of the conjecture by LaShell et al, we observe 100% polarization of these states in local regions of momentum space. The spins are aligned in the plane of the surface, perpendicular to the electronic momentum relative to the S-bar symmetry point. @FootnoteText@ @footnote 1@ S. LaShell, B. A. McDougall, and E. Jensen, Phys. Rev. Lett. 77, 3419 (1996).@footnote 2@ E. Rotenberg, J. W. Chung, S. D. Kevan, Phys. Rev. Lett. 82, 4066 (1999).