Browsing by Author "Slavonic, C."

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    Topological metal behavior in GeBi2Te4 single crystals
    (American Physical Society, 2013) Marcinkova, A.; Wang, J.K.; Slavonic, C.; Nevidomskyy, Andriy H.; Kelly, K.F.; Filinchuk, Y.; Morosan, E.
    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.