Regensburg 2019 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 5: Topological insulators

HL 5.13: Talk

Monday, April 1, 2019, 12:45–13:00, H36

Topological Crystalline Protection in the BHZ and Kane-Mele models — •Fernando Dominguez, Benedikt Scharf, and Ewelina M. Hanckiewicz — Wuerzburg University, Wuerzburg, Germany

We investigate the topological crystalline protection against in-plane magnetic fields that naturally appears in two general quantum spin Hall models: the BHZ and and the Kane-Mele models [1]. This protection avoids the mixing of counter propagating modes and arises through the combination of particle-hole and reflection symmetries. Indeed, a gap can be opened in the presence of terms that break one of the mentioned symmetries. Therefore, we explore the impact on the gap opening of different coupling terms that break particle-hole symmetry, such as, Rashba spin-orbit coupling, a staggered potential, next-nearest neighbor hopings, anisotropic g-factor and lattice strain.

[1] F. Dominguez, B. Scharf, G. Li, J. Schäfer, R. Claessen, W. Hanke, R. Thomale, and E. M. Hankiewicz, Phys. Rev. B 98 , 161407 (2018).