Dresden 2020 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 12: Topological Insulators 2 (joint session TT/HL)

TT 12.6: Vortrag

Montag, 16. März 2020, 16:15–16:30, HSZ 103

Strong topology and Dirac semimetal phase in cubic half-Heusler under strain — •Sanjib Kumar Das1, Jorge Facio1, Ion Cosma Fulga1, and Jeroen van den Brink1,21IFW Dresden, Helmholtzstrasse 20, 01069 Dresden — 2Department of Physics, Technical University Dresden, 01062 Dresden, Germany

Theoretically, many half-Heusler compounds exhibit topological phases under strain. Depending on sign of the strain, they can host either a Dirac semimetal or a topological insulating phase. Strain along a suitable direction can split the quadratic band crossing of the bulk band structure, and hence open up a topological gap in these materials. By combining density functional theory(DFT) and tight-binding model calculations, we show that one such cubic half-Heusler material hosts strong topological and Dirac semimetallic phases under compressive or tensile strain, respectively. We hope that our work will motivate further experiments in this direction.

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