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Dresden 2020 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 103: Topology and Symmetry Protected Materials I

O 103.1: Vortrag

Donnerstag, 19. März 2020, 10:30–10:45, WIL A317

Zero Energy Bound States in the Proximity Induced Topological Superconductor System Bi2Te3 on Nb(110) — •Felix Kuester1, Yunyi Zhang1, Matthew Gilbert2, Paolo Sessi1, and Stuart Parkin11Max-Planck-Institute for Microstructure Physics, Halle (Saale), Germany — 2University of Illinois, Urbana-Champaign, USA

Majorana bound states can be hosted by states on the surface of a strong topological insulator coupled to an ordinary s-wave superconductor and localized inside Abrikosov vortices (Fu and Kane 2008). This prediction provided the ingredients needed to find topologically protected, robust quantum states suited to form Qbits and motivated experimental research to investigate such structures thoroughly. We observed, by measuring differential conductance spectra and maps, zero-energy bound states inside vortices on 5 QL Bi2Te3 grown by MBE on Nb(110) to create a proximity induced topological superconductor system. Bi2Te3 is a strong topological insulator with a single Dirac cone at the gamma point which was confirmed by ARPES data on our sample. A comparison shows that neither the bare Nb(110) nor a proximity induced Pt film on the Nb(110) substrate exhibit a zero-energy peak in the vortex core or other anomalous features observed on the Bi2Te3 film. Therefore we suggest that the observed phenomena of unconventional superconductivity originate from the topological character of the Bi2Te3 surface.

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