Topological metal behavior in GeBi2Te4 single crystals
(2013) Physical Review B - Condensed Matter and Materials Physics — Vol. 88, n° 16 (2013)
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- Abstract
- 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.
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Citations
Marcinkova, A., Wang, J. K., Slavonic, C., Nevidomskyy, A. H., Kelly, K. F., Filinchuk, Y., & Morosan, E. (2013). Topological metal behavior in GeBi2Te4 single crystals. Physical Review B - Condensed Matter and Materials Physics, 88(16). https://doi.org/10.1103/PhysRevB.88.165128 (Original work published 2013)