1209.1219 (Y. Ohtsubo et al.)

Giant Anisotropy of Spin-Orbit Splitting at the Bismuth Surface    [PDF]

Y. Ohtsubo, J. Mauchain, J. Faure, E. Papalazarou, M. Marsi, P. Le Févre, F. Bertran, A. Taleb-Ibrahimi, L. Perfetti

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 $\textbf{k}\cdot \textbf{p}$ 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.

View original: http://arxiv.org/abs/1209.1219