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TT: Fachverband Tiefe Temperaturen

TT 63: Topological Insulators: Theory (jointly with HL, DS, MA, O)

TT 63.2: Vortrag

Mittwoch, 18. März 2015, 09:45–10:00, ER 270

Spin chirality tuning and Weyl semimetal in strained HgS_1−xTe_x — •Tomáš Rauch¹, Steven Achilles¹, Jürgen Henk¹, and Ingrid Mertig^1,2 — 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 HgS_1−xTe_x. 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.