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ISSN - 13672630, New Journal of Physics, 2013, vol. 15, p. -

Bulk and surface Rashba splitting in single termination BiTeCl

Landolt Gabriel, Eremeev Sergey V., Tereshchenko Oleg E., Muff Stefan, Slomski Bartosz, Kokh Konstantin A., Kobayashi Masaki, Schmitt Thorsten, Strocov Vladimir N., Osterwalder Jürg, Chulkov Evgueni V., Hugo Dil J.

By angle-resolved photoemission spectroscopy (ARPES) we observe a giant Rashba-type spin splitting in the electronic bulk conduction and valence bands of the semiconductor BiTeCl. This material belongs to the group of bismuth tellurohalides BiTeX (X = Cl,Br,I) which are layered non-centrosymmetric materials with strong spin-orbit interaction. By photon energy-dependent ARPES, we separate the bulk and surface contribution of the electronic structure and show that the tellurium-terminated (0001) crystal surface hosts spin-split two-dimensional surface states. On the chlorine-terminated surface at the opposite side of the crystal no surface states are observed due to photon-induced surface chemistry. © IOP Publishing and Deutsche Physikalische Gesellschaft.