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

Please always quote using this URN: urn:nbn:de:bvb:20-opus-119467
  • 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 fromThe 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 at the two terminations. Our investigations provide insight into the importance of structural imperfections as well as intrinsic and extrinsic defects on the electronic properties of BiTeI surfaces and their temporal stability.show moreshow less

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Metadaten
Author: Sebastian Fiedler, Lydia El-Kareh, Sergey V. Eremeev, Oleg E. Tereshchenko, Christoph Seibel, Peter Lutz, Konstantin A. Kokh, Evgueni V. Chulkov, Tatyana V. Kuznetsova, Vladimir I. Grebennikov, Hendrik Bentmann, Matthias Bode, Friedrich Reinert
URN:urn:nbn:de:bvb:20-opus-119467
Document Type:Journal article
Faculties:Fakultät für Physik und Astronomie / Physikalisches Institut
Language:English
Parent Title (English):New Journal of Physics
ISSN:1367-2630
Year of Completion:2014
Volume:16
Issue:075013
Source:New Journal of Physics 16 (2014) 075013. doi:10.1088/1367-2630/16/7/075013
DOI:https://doi.org/10.1088/1367-2630/16/7/075013
Dewey Decimal Classification:5 Naturwissenschaften und Mathematik / 54 Chemie / 541 Physikalische Chemie
Tag:electronic structure; semiconductor surfaces; spin–orbit coupling; surface morphology
PACS-Classification:60.00.00 CONDENSED MATTER: STRUCTURAL, MECHANICAL, AND THERMAL PROPERTIES / 68.00.00 Surfaces and interfaces; thin films and nanosystems (structure and nonelectronic properties) (for surface and interface chemistry, see 82.65.+r, for surface magnetism, see 75.70.Rf) / 68.35.-p Solid surfaces and solid-solid interfaces: structure and energetics / 68.35.B- Structure of clean surfaces (and surface reconstruction)
70.00.00 CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES / 71.00.00 Electronic structure of bulk materials (see section 73 for electronic structure of surfaces, interfaces, low-dimensional structures, and nanomaterials; for electronic structure of superconductors, see 74.25.Jb) / 71.22.+i Electronic structure of liquid metals and semiconductors and their alloys
70.00.00 CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES / 71.00.00 Electronic structure of bulk materials (see section 73 for electronic structure of surfaces, interfaces, low-dimensional structures, and nanomaterials; for electronic structure of superconductors, see 74.25.Jb) / 71.55.-i Impurity and defect levels / 71.55.Ht Other nonmetals
70.00.00 CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES / 71.00.00 Electronic structure of bulk materials (see section 73 for electronic structure of surfaces, interfaces, low-dimensional structures, and nanomaterials; for electronic structure of superconductors, see 74.25.Jb) / 71.70.-d Level splitting and interactions (see also 73.20.-r Surface and interface electron states; 75.30.Et Exchange and superexchange interactions) / 71.70.Ej Spin-orbit coupling, Zeeman and Stark splitting, Jahn-Teller effect
70.00.00 CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES / 73.00.00 Electronic structure and electrical properties of surfaces, interfaces, thin films, and low-dimensional structures (for electronic structure and electrical properties of superconducting films and low-dimensional structures, see 74.78.-w; for computational / 73.20.-r Electron states at surfaces and interfaces / 73.20.At Surface states, band structure, electron density of states
70.00.00 CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES / 79.00.00 Electron and ion emission by liquids and solids; impact phenomena / 79.60.-i Photoemission and photoelectron spectra / 79.60.Bm Clean metal, semiconductor, and insulator surfaces
Release Date:2015/11/09
Licence (German):License LogoCC BY: Creative-Commons-Lizenz: Namensnennung