We investigate the bismuth (111) surface by means of time and angle resolved photoelectron spectroscopy. The parallel detection of the surface states below and above the Fermi level reveals a giant anisotropy of the Spin-Orbit (SO) spitting. These strong deviations from the Rashba-like coupling cannot be treated in k⋅p perturbation theory. Instead, first principle calculations could accurately reproduce the experimental dispersion of the electronic states. Our analysis shows that the giant anisotropy of the SO splitting is due to a large out-of plane buckling of the spin and orbital texture.
@article{arxiv.1209.1219,
title = {Giant Anisotropy of Spin-Orbit Splitting at the Bismuth Surface},
author = {Y. Ohtsubo and J. Mauchain and J. Faure and E. Papalazarou and M. Marsi and P. Le Févre and F. Bertran and A. Taleb-Ibrahimi and L. Perfetti},
journal= {arXiv preprint arXiv:1209.1219},
year = {2016}
}