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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 Parkin1 — 1Max-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.