Journal
PHYSICAL REVIEW B
Volume 91, Issue 8, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.91.085402
Keywords
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Funding
- bilateral program Russian-German Laboratory at BESSY II
- DFG [SPP 1666]
- Impuls- und Vernetzungsfonds der Helmholtz-Gemeinschaft [HRJRG-408]
- Russian Foundation for Basic Research [13-02-91327, 13-03-96032, 14-02-31716]
- G-RISC (German-Russian Interdisciplinary Science Center) Centre of Excellence
- Ural Branch of Russian Academy of Sciences [12-U-3-1006, 12-M-23-2010]
- Austrian Science Fund [SFB-025 IR-ON]
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Understanding how topologically protected surface states behave at surfaces and interfaces requires knowledge of the atomic structure. Whether the (111) surfaces of the prototypical topological insulators Bi2Se3 and Bi2Te3 are Bi or chalcogen terminated is the subject of current controversies. We employ photoelectron diffraction and holography, combining the advantages and avoiding the disadvantages of the contesting techniques previously used. We find bulklike chalcogen termination with a very small surface relaxation (<1%) in agreement with density functional theory simulations. We prove the chalcogen termination for cleaved crystals and epitaxial films which shows the robustness of our conclusions.
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