Nanoscale Mach-Zehnder interferometer with spin-resolved quantum Hall edge states

TL;DR

This paper reports the development of a nanoscale Mach-Zehnder interferometer utilizing spin-resolved quantum Hall edge states, demonstrating gate-controlled quantum interference at elevated temperatures with a theoretical model explaining the observed oscillations.

Contribution

The work introduces a novel nanoscale interferometer with spin-resolved edge states and provides a simple model to explain the interference patterns observed.

Findings

Quantum interference persists at higher temperatures.

Resonant charge transfer is achieved via top-gate nanofingers.

Theoretical model matches experimental oscillation data.

Abstract

We realize a nanoscale-area Mach-Zehnder interferometer with co-propagating quantum Hall spin-resolved edge states and demonstrate the persistence of gate-controlled quantum interference oscillations, as a function of an applied magnetic field, at relatively large temperatures. Arrays of top-gate magnetic nanofingers are used to induce a resonant charge transfer between the pair of spin-resolved edge states. To account for the pattern of oscillations measured as a function of magnetic field and gate voltage, we have developed a simple theoretical model which satisfactorily reproduces the data.