Dresden 2020 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 53: Topology: Majorana Physics
TT 53.2: Talk
Thursday, March 19, 2020, 09:45–10:00, HSZ 103
High-Temperature Majorana Fermions in Magnet-Superconductor Hybrid Systems — Daniel Crawford1, Eric Mascot2, Dirk Morr2, and •Stephan Rachel1 — 1School of Physics, University of Melbourne, Parkville, VIC 3010, Australia — 2University of Illinois at Chicago, Chicago, IL 60607, USA
Magnet-superconductor hybrid structures represent one of the most promising platforms to realize, control and manipulate Majorana modes using scanning tunneling methods. By depositing either chains or islands of magnetic atoms on the surface of a conventional superconductor such as Pb or Re, topological superconducting phases can emerge. They feature either localised Majorana bound states at the chain ends or dispersing chiral Majorana modes at the island's boundary. Yet many of these experiments have not reached the spectral resolution to clearly distinguish between topological Majorana and trivial Shiba peaks due to tiny gap sizes in experiments performed at sub-Kelvin temperatures. Here we consider superconducting substrates with unconventional spin-singlet pairing, including high-temperature d-wave and extended s-wave superconductors. We derive topological phase diagrams and compute edge states for cylinder and island geometries and discuss their properties. Also various time-reversal invariant topological superconducting phases of the Zhang-Kane-Mele type are found and discussed. Quite generally, we find that unconventional superconducting substrates work as well as the conventional s-wave substrates to realize topological superconducting phases.