Journal Article

PreJuSER-9997

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Surface- and edge-states in ultrathin Bi-Sb films

Bihlmayer, G.FZJ* ; Koroteev, Y. M. ; Chulkov, E. V. ; Blügel, S.FZJ*

2010
Dt. Physikalische Ges. [Bad Honnef]

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Please use a persistent id in citations: http://hdl.handle.net/2128/28976  doi:10.1088/1367-2630/12/6/065006

Abstract: Employing first-principles calculations, we studied the electronic structure of ultrathin Bi-Sb films, focusing on the appearance of surface or edge states that are topologically protected. Our calculations show that in ordered structures the Bi-Sb bonds are quite strong, forming well-defined double layers that contain both elements. We find surface states appearing on the (111) surface of a thin film of layerwise ordered Bi-Sb compound, while thin films in (110) orientation are insulating. In the gap of this insulator, edge states can be found in a (110)-oriented ribbon in the A17 (black phosphorus) structure. While these states are strongly spin polarized, their topological properties are found to be trivial. In all structures, we investigate the influence of spin-orbit coupling and analyze spin polarization of the states at the boundaries of the material.

Keyword(s): J

Note: GB is grateful for the hospitality of the Donostia International Physics Center, where part of this work originated, and the financial support of the Deutsche Forschungsgemeinschaft (grant no. BI823/1-1).

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Contributing Institute(s):

1. Quanten-Theorie der Materialien (IFF-1)
2. Quanten-Theorie der Materialien (IAS-1)
3. Jülich-Aachen Research Alliance - Fundamentals of Future Information Technology (JARA-FIT)
4. Jülich Aachen Research Alliance - High-Performance Computing (JARA-HPC)

Research Program(s):

1. Grundlagen für zukünftige Informationstechnologien (P42)

Appears in the scientific report 2010

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