Freiburg 2019 – scientific programme
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FM: Fall Meeting
FM 34: Topology: Solid State Systems
FM 34.3: Talk
Tuesday, September 24, 2019, 14:45–15:00, 1199
Chiral Majorana fermions in proximity-modified graphene — •Petra Högl1, Tobias Frank1, Denis Kochan1, Martin Gmitra2, and Jaroslav Fabian1 — 1Institute for Theoretical Physics, University of Regensburg, 93040 Regensburg, Germany — 2Department of Theoretical Physics and Astrophysics, Pavol Jozef Šafárik University, 04001 Košice, Slovakia
Chiral Majorana fermions are massless self-conjugate fermions which arise as propagating edge states of 2d topological superconductors. Recently, a scheme for topological quantum computation based on chiral Majorana fermions has been proposed [1]. We show the appearance of chiral Majorana edge modes in graphene by computing zigzag and armchair ribbon spectra. For this we use an effective model of graphene which takes into account proximity induced spin-orbit coupling and exchange field. This leads to a quantum anomalous Hall state which turns into a topological superconductor by adding superconducting proximity coupling. We prove the topological nature of the system by analyzing the Chern number of the 2d bulk. This work has been supported by DFG SFB 1277 (Project B07) and EU Seventh Framework Programme under Grant Agreement No. 604391 Graphene Flagship.
[1] B. Lian, X.-Q. Sun, A. Vaezi, X.-L. Qi, S.-C. Zhang, PNAS 115, 10938 (2018)