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Title

Atomic relaxations at the (0001) surface of Bi2Se3 single crystals and ultrathin films

AuthorsRoy, Sumalay; Meyerheim, Holger L.; Ernst, Arthur; Otrokov, M. M.; Vergniory, M.; Chulkov, Eugene V. CSIC ORCID; Kirschner, J.
Issue Date2014
PublisherAmerican Physical Society
CitationPhysical Review B 90(15): 155456 (2014)
AbstractWe present a surface x-ray analysis of the atomic structure of the (0001) surface of the topological insulator Bi2Se3, which was grown as a single crystal and as an ultrathin film on Si(111) using molecular beam epitaxy (MBE). In general we find that the top Se-Bi layer spacing is expanded between 2% and 17% relative to the bulk, while deeper layers and the first van der Waals gap are unrelaxed. The top layer expansion is directly related to the amount of surface contamination by carbon and oxygen. The near-surface structures of the single crystal and the MBE-grown thin film differ in the degree of (static) disorder: for the former an overall Debye parameter (B) per quintuple layer (QL) of 5Å2 is found to decrease slowly with depth. MBE-grown Bi2Se3 films exhibit the opposite scenario, characterized by an increase in B from about 10Å2 for the topmost QL to values of B=20-40 Å2 for the fourth QL. This is attributed to the lattice misfit to the Si(111) surface. Ab initio calculations reveal carbon to act as an n-dopant, while the first interlayer spacing expansion induces a shift of the Dirac point towards the Bi2Se3 bulk conduction band minimum.
DescriptionUnder the terms of the Creative Commons Attribution License 3.0 (CC-BY).-- et al.
Publisher version (URL)http://dx.doi.org/10.1103/PhysRevB.90.155456
URIhttp://hdl.handle.net/10261/136880
DOI10.1103/PhysRevB.90.155456
Identifiersdoi: 10.1103/PhysRevB.90.155456
issn: 2469-9950
e-issn: 2469-9969
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