KIT | KIT-Bibliothek | Impressum | Datenschutz
Open Access Logo
DOI: 10.5445/IR/1000049216
Veröffentlicht am 22.03.2018
DOI: 10.1088/1367-2630/16/7/075013
Zitationen: 11
Web of Science
Zitationen: 11

Defect and structural imperfection effects on the electronic properties of BiTeI surfaces

Fiedler, Sebastian; El-Kareh, Lydia; Eremeev, Sergey V.; Tereshchenko, Oleg E.; Seibel, Christoph; Lutz, Peter; Kokh, Konstantin A.; Chulkov, Evgueni V.; Kuznetsova, Tatyana V.; Grebennikov, Vladimir I.; Bentmann, Hendrik; Bode, Matthias; Reinert, Friedrich

The surface electronic structure of the narrow-gap seminconductor BiTeI exhibits a large Rashba-splitting which strongly depends on the surface termination. Here we report on a detailed investigation of the surface morphology and electronic properties of cleaved BiTeI single crystals by scanning tunneling microscopy, photoelectron spectroscopy (ARPES, XPS), electron diffraction (SPA-LEED) and density functional theory calculations. Our measurements confirm a previously reported coexistence of Te- and I-terminated surface areas originating from bulk stacking faults and find a characteristic length scale of ~100 nm for these areas. We show that the two terminations exhibit distinct types of atomic defects in the surface and subsurface layers. For electronic states resided on the I terminations we observe an energy shift depending on the time after cleavage. This aging effect is successfully mimicked by depositon of Cs adatoms found to accumulate on top of the I terminations. As shown theoretically on a microscopic scale, this preferential adsorbing behaviour results from considerably different energetics and surface diffusion lengths ... mehr

Zugehörige Institution(en) am KIT Institut für Experimentelle Kernphysik (IEKP)
Publikationstyp Zeitschriftenaufsatz
Jahr 2014
Sprache Englisch
Identifikator ISSN: 1367-2630
URN: urn:nbn:de:swb:90-492162
KITopen ID: 1000049216
Erschienen in New Journal of Physics
Band 16
Seiten 075013
Schlagworte electronic structure, spin-orbit coupling, surface morphology, semiconductor surfaces
KIT – Die Forschungsuniversität in der Helmholtz-Gemeinschaft KITopen Landing Page