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Topological metal behavior in GeBi2Te4 single crystals

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Marcinkova, A. [autre] Wang, J.K. [autre] Slavonic, C. [autre] Nevidomskyy, A.H. [autre] Kelly, K.F. [autre] Filinchuk, Yaroslav [UCL] Morosan, E. [autre]

The metallic character of the GeBi2Te4 single crystals is probed using a combination of structural and physical properties measurements, together with density functional theory (DFT) calculations. The structural study shows distorted Ge coordination polyhedra, mainly of the Ge octahedra. This has a major impact on the band structure, resulting in bulk metallic behavior of GeBi2Te4, as indicated by DFT calculations. Such calculations place GeBi2Te4 in a class of a few known nontrivial topological metals, and explains why an observed Dirac point lies below the Fermi energy at about -0.12 eV. A topological picture of GeBi2Te4 is confirmed by the observation of surface state modulations by scanning tunneling microscopy. © 2013 American Physical Society.

Document type Article de périodique (Journal article) – Article de recherche
Access type Accès libre
Publication date 2013
Language Anglais
Journal information "Physical Review B - Condensed Matter and Materials Physics" - Vol. 88, no. 16 (2013)
Peer reviewed yes
issn 1098-0121
Publication status Publié
Affiliation UCL - SST/IMCN/MOST - Molecules, Solids and Reactivity
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Bibliographic reference Marcinkova, A. ; Wang, J.K. ; Slavonic, C. ; Nevidomskyy, A.H. ; Kelly, K.F. ; et. al. Topological metal behavior in GeBi2Te4 single crystals. In: Physical Review B - Condensed Matter and Materials Physics, Vol. 88, no. 16 (2013)
Permanent URL http://hdl.handle.net/2078.1/140768