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TT: Fachverband Tiefe Temperaturen

TT 65: Poster Session Topological Topics

TT 65.22: Poster

Donnerstag, 19. März 2020, 15:00–19:00, P2/EG

Disorder effects on the spectral gap of topological insulator based Majorana zero modes — •Alexander Ziesen and Fabian Hassler — RWTH Aachen University, Aachen, Germany

We consider a 3D topological insulator (TI) proximitized by an s-wave superconductor with a vortex. It is known that the vortex traps a single unpaired Majorana zero mode (MZM). We numerically investi- gate the disorder dependence of the in-gap states. In particular, we concentrate on onsite potential disorder effects on the spectral gap for a chemical potential both being close and far away from the Dirac point. A large gap is desirable for this MZM to potentially be used for quantum information applications. We also show that one can ef- ficiently simulate the 2D surface transport of a 3D TI using a three dimensional tight binding model and that we can restrict ourselves to purely surface disorder to correctly model the vortex setup.