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Freiburg 2019 – wissenschaftliches Programm

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FM: Fall Meeting

FM 64: Poster: Topology

FM 64.4: Poster

Mittwoch, 25. September 2019, 16:30–18:30, Tents

Andreev spectroscopy in topological insulating Josephson junctions — •Richard Bounds1, Christian Dickel1, Junya Feng1, Jonas Krause1,2, Shabir Barzanjeh3, Johannes Fink3, and Yoichi Ando11University of Cologne — 2ETH Zurich — 3IST Austria

There are currently multiple efforts to realise a new kind of qubit based on topologically protected Majorana zero modes (MBS). One proposed realization resides in topological insulator nanowires proximitized with an s-wave superconductor. Josephson junctions on topological insulator materials would also host Andreev bound states (ABS). We aim to study the ABS spectrum of a topological insulator junction in the RF SQUID configuration coupled to a microwave resonator, in order to better understand the transport in the junction, in particular its dependence of the phase difference across the junction. Such spectroscopy, performed on planar junctions as well as nanowire junctions, will allows us to directly address the possible 4π periodicity of the Andreev levels and quasiparticle poisoning dynamics. The latter would likely also be a limiting factor for MBS physics and is therefore an important prerequisite experiment toward realising MBS qubits.

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