Quantum Hall Meets Superconductivity: Interference of Chiral Andreev Edge States
Harold Baranger, Department of Physics, Duke University
Abstract.— The boundaries between distinct quantum states have attracted increasing interest as a setting for novel topological and correlated phenomena. I will discuss our work on the interface between two prototypical phases of electronic matter with conceptually different ground states: the integer quantum Hall insulator and the s-wave superconductor. Hybridized electron-hole states called “chiral Andreev edge states” propagate along this interface in the direction determined by the magnetic field. Interference between these states can turn an incoming electron into an outgoing electron or hole, depending on the phase accumulated along the interface. I shall present experimental results from the group of my colleague Gleb Finkelstein as well as our theoretical understanding backed up by numerical calculations.
Host: Harsh Mathur