Dresden 2017 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 85: Topological Insulators III (joined session with TT)

HL 85.9: Talk

Friday, March 24, 2017, 12:00–12:15, POT 251

Topological phase space study of a generalized Kane-Mele spin-orbit Hamiltonian — •Tobias Frank, Petra Högl, Martin Gmitra, Denis Kochan, and Jaroslav Fabian — Theoretische Physik, Universität Regensburg

We study a generalized Kane-Mele [1] graphene spin-orbit coupling Hamiltonian, that is able to describe hybrid systems like graphene on transition metal dichalcogenides [2] or graphene - metal interfaces [3] with broken inversion symmetry. We identify the topological phase space in terms of its Z₂ invariant by variation of spin-orbit coupling parameters. We as well analyze the bulk-edge correspondence in terms of zigzag and armchair ribbons. We find that spin-orbit coupling proximitized graphene can exhibit helical edge states at the zigzag boundary even if it is in the trivial topological phase.

This work is supported by the DFG GRK 1570, SFB 689, and European Union Seventh Framework Programme under Grant Agreement No. 604391 Graphene Flagship.

[1] C. L. Kane and E. J. Mele, PRL 95 226801 (2005)

[2] M. Gmitra, D. Kochan, P. Högl, and J. Fabian, PRB 93 155104 (2016)

[3] T. Frank, M. Gmitra, and J. Fabian, PRB 93 155142 (2016)