Berlin 2015 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 41: Topological insulators: Theory (with DS/MA/O/TT)
HL 41.2: Vortrag
Mittwoch, 18. März 2015, 09:45–10:00, ER 270
Spin chirality tuning and Weyl semimetal in strained HgS1−xTex — •Tomáš Rauch1, Steven Achilles1, Jürgen Henk1, and Ingrid Mertig1,2 — 1Institut für Physik, Martin-Luther-Universität Halle-Wittenberg, D-06099 Halle (Saale), Germany — 2Max-Planck-Institut für Mikrostrukturphysik, D-06120 Halle (Saale), Germany
We have theoretically investigated the phase diagram of HgS1−xTex. The parameters which have been varied are the concentration x and the in-plane strain, which could be applied by an appropriate substrate in an experiment. In the topological phase diagram we found a normal metallic phase, two topological insulator phases with different spin chiralities of the surface states and a Weyl semi-metal phase. The phases have been probed by calculating topological invariants and the dispersion of the surface states for both crystal terminations of the (001) surface by an ab-initio based tight-binding model.