# Interference of chiral Andreev edge states

## TL;DR

This paper investigates chiral Andreev edge states at the interface between quantum Hall insulators and s-wave superconductors, revealing their potential for coherent quantum manipulation.

## Contribution

It introduces and characterizes chiral Andreev edge states, a new type of hybridized electron-hole excitation at topological interfaces.

## Key findings

- Identification of chiral Andreev edge states (CAES) at the interface.
- Demonstration of interference effects of CAES along the interface.
- Potential for coherent manipulation of these excitations.

## Abstract

The search for topological excitations such as Majorana fermions has spurred interest in the boundaries between distinct quantum states. Here, we explore an interface between two prototypical phases of electrons with conceptually different ground states: the integer quantum Hall insulator and the s-wave superconductor. We find clear signatures of hybridized electron and hole states similar to chiral Majorana fermions, to which we refer as chiral Andreev edge states (CAES). They propagate along the interface in the direction determined by magnetic field and their interference can turn an incoming electron into an outgoing electron or a hole, depending on the phase accumulated by the CAES along their path. Our results demonstrate that these excitations can propagate and interfere over a significant length, opening future possibilities for their coherent manipulation.