Fermi Surface and Anisotropic Spin-Orbit Coupling of Sb(111) studied by   Angle-Resolved Photoemission Spectroscopy
  High-resolution angle-resolved photoemission spectroscopy has been performed on Sb(111) to elucidate the origin of anomalous electronic properties in group-V semimetal surfaces. The surface was found to be metallic despite the semimetallic character of bulk. We clearly observed two surface-derived Fermi surfaces which are likely spin split, demonstrating that the spin-orbit interaction plays a dominant role in characterising the surface electronic states of group-V semimetals. Universality/disimilarity of the electronic structure in Bi and Sb is discussed in relation to the granular superconductivity, electron-phonon coupling, and surface charge/spin density wave. 
K. Sugawara, T. Sato, S. Souma, T. Takahashi, M. Arai, and T. Sasaki