Berlin 2015 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 13: Electronic Structure of Surfaces II
O 13.4: Vortrag
Montag, 16. März 2015, 16:00–16:15, MA 041
Spin-resolved electronic structure of BiTeI — •Henriette Maaß1, Christoph Seibel1, Hendrik Bentmann1, Christian Tusche2, Taichi Okuda3, Thiago Peixoto1, Oleg Tereschchenko4, Jürgen Kirschner2, and Friedrich Reinert1 — 1Experimentelle Physik VII, Universität Würzburg, D-97074 Würzburg — 2Max-Planck-Institut für Mikrostrukturphysik, Am Weinberg 2, D-06120 Halle — 3Hiroshima Synchrotron Radiation Center, Hiroshima University, Higashi-Hiroshima 739-0046, Japan — 4Institute of Semiconductor Physics, 636090, Novosibirsk, Russia
The non-centrosymmetric lattice structure and large spin-orbit interaction in bismuth tellurohalides lead to large Rashba-type spin-splittings in the bulk and surface electronic structure of these materials. The resulting spin structure is predicted to be highly dependent on the orbital character of the electronic states [1]. Deploying a spin- and angle- resolving photoelectron spectrometer based on very-low-energy electron diffraction [2] and a momentum microscope with an imaging spin filter [3] we investigated the photoelectron spin polarization of the surface band structure of BiTeI for a subset of energies and momenta. Our experiments reveal a peculiar spin-structure yielding evidence for an orbital dependence of the Rashba-splitting. In particular we find evidence for a correlation between the photoelectron spin and the orbital character of the Rashba surface band.
[1] Z. Zhu et al., New J. Phys. 15, 023010, (2013)
[2] T. Okuda et al., Rev. of Sci. Instr. 82, 103302, (2011)
[3] C. Tusche et al., Ultramicroscopy 130, 70-76, (2013)