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Dresden 2014 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 101: Transport - Poster Session

TT 101.37: Poster

Thursday, April 3, 2014, 15:00–19:00, P2

Electronic correlations in bulk Bi-chalcogenide topological insulators and elemental bismuth — •Luis Craco1 and Stefano Leoni21Instituto de Fisica, Universidade Federal de Mato Grosso, 78060-900, Cuiaba, MT, Brazil — 2School of Chemistry, Cardiff University, Cardiff, CF10 3AT, UK

In recent years three-dimensional (3D) topological insulators (TIs) have attracted great fundamental interest as systems that can lead to new phases of quantum matter. Theoretical and experimental work have revealed that intrinsic spin-orbit (SO) coupling can drive qualitative new effects on the electronic structure of Bi-chalcogenide p-band systems in general. In this poster, we present our recent work on electronic structure and transport properties of bulk Bi2Se3 [1] and Bi2Te2Se [2] TIs. We will also revisit the long-standing issues of transport and magnetoresistance responses in elemental bismuth [3]. Basing ourselves on LDA+DMFT calculations we show that the interplay between SO and multi-orbital Coulomb interactions has quantitative new effects in their semimetal electronic structure. We show, for example, why the intricate interplay between local Coulomb and SO interaction promotes a spin-orbit Kondo state in elemental bismuth. Taken together our work represents a realization of complex dynamical correlation effects in p-band semimetals and in bulk Bi-chalcogenide TIs.
L. Craco and S. Leoni, Phys. Rev. B 85, 075114 (2012)
L. Craco and S. Leoni, Phys. Rev. B 85, 195124 (2012)
L. Craco and S. Leoni, in preparation

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