Spin-Resolved Photoemission of Surface States ofW(110)−(1×1)H

Abstract

The surface electronic states of $\mathrm{W}(110)\mathrm{\text{−}}(1\times 1)\mathrm{H}$ have been measured using spin- and angle-resolved photoemission. We directly demonstrate that the surface bands are both split and spin-polarized by the spin-orbit interaction in association with the loss of inversion symmetry near a surface. We observe 100% spin polarization of the surface states, with the spins aligned in the plane of the surface and oriented in a circular fashion relative to the $\overline{\mathrm{S}}$ symmetry point. In contrast, no measurable polarization of nearby bulk states is observed.