future events

Chiral Andreev edge states in the quantum Hall regime

TYPECondensed Matter Seminar
Speaker:Gleb Finkelstein
Affiliation:Duke University
Time:12:30 - 13:30
Location:Lidow Nathan Rosen (300)

We explore graphene samples in a contact with a type II superconductor at high magnetic fields. In the quantum Hall regime, we observe signatures of the chiral Andreev edge states (CAES) formed along the interface with the superconductor. These single particle states consist of electrons and holes hybridized in a fashion similar to Majorana fermions. Qualitatively, the CAES can be visualized as a result of multiple Andreev reflections of a single electron/hole skipping along the superconducting interface. In our experiment, the signatures of the CAES are found to be sensitive to the configuration of vortices in the superconductor, which determine their loss and decoherence.