HgTe is a versatile topological material and has enabled the realization of a variety of topological states, including two-and three-dimensional (3D) topological insulators and topological semimetals. Nevertheless, a quantitative understanding of its electronic structure remains challenging, in particular, due to coupling of the Te 5p-derived valence electrons to Hg 5d core states at shallow binding energy. We present a joint experimental and theoretical study of the electronic structure in strained HgTe(001) films in the 3D topological-insulator regime, based on angle-resolved photoelectron spectroscopy and density functional theory. The results establish detailed agreement in terms of: (i) electronic band dispersions and orbital symmetries, (ii) surface and bulk contributions to the electronic structure, and (iii) the importance of Hg 5d states in the valence-band formation. Supported by theory, our experiments directly image the paradigmatic band inversion in HgTe, underlying its nontrivial band topology.
Vidal, R.C., Marini, G., Lunczer, L., Moser, S., Fürst, L., Issing, J., et al. (2023). Topological band inversion in HgTe(001): Surface and bulk signatures from photoemission. PHYSICAL REVIEW. B, 107(12), 1-6 [10.1103/physrevb.107.l121102].
Topological band inversion in HgTe(001): Surface and bulk signatures from photoemission
Di Sante, Domenico;
2023
Abstract
HgTe is a versatile topological material and has enabled the realization of a variety of topological states, including two-and three-dimensional (3D) topological insulators and topological semimetals. Nevertheless, a quantitative understanding of its electronic structure remains challenging, in particular, due to coupling of the Te 5p-derived valence electrons to Hg 5d core states at shallow binding energy. We present a joint experimental and theoretical study of the electronic structure in strained HgTe(001) films in the 3D topological-insulator regime, based on angle-resolved photoelectron spectroscopy and density functional theory. The results establish detailed agreement in terms of: (i) electronic band dispersions and orbital symmetries, (ii) surface and bulk contributions to the electronic structure, and (iii) the importance of Hg 5d states in the valence-band formation. Supported by theory, our experiments directly image the paradigmatic band inversion in HgTe, underlying its nontrivial band topology.File | Dimensione | Formato | |
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