Quantum Andreev Oscillations in normal-superconducting-normal nanostructures

TL;DR

This paper demonstrates quantum Andreev oscillations in normal-superconducting-normal nanostructures caused by electron wave interference, with experimental results aligning with theoretical predictions.

Contribution

It provides experimental evidence of quantum Andreev oscillations in nanostructures and explains their behavior using interference theory.

Findings

Oscillations depend on magnetic field and input current

Oscillation periods match theoretical predictions

Devices act as electron Fabry-Perot interferometers

Abstract

We show that the voltage drop of specially prepared normal-superconducting-normal nanostructures show quantum Andreev oscillations as a function of magnetic field or input current. These oscillations are due to the interference of the electron wave function between the normal parts of the structure that act as reflective interfaces, i.e. our devices behave as a Fabry-Perot interferometer for conduction electrons. The observed oscillations and field periods are well explained by theory.