Generation of energy selective excitations in quantum Hall edge states

TL;DR

This paper presents a high-field quantum Hall device that generates energy-selective single-electron excitations, enabling detailed studies of edge state dynamics in extreme magnetic conditions.

Contribution

It introduces an on-demand single-electron source operating at high magnetic fields, capable of emitting energy-tuned charges in fractional quantum Hall states.

Findings

Successful operation at magnetic fields up to 30T

Generation of energy-selective single-electron excitations

Potential for studying edge state excitations and relaxation

Abstract

We operate an on-demand source of single electrons in high perpendicular magnetic fields up to 30T, corresponding to a filling factor below 1/3. The device extracts and emits single charges at a tunable energy from and to a two-dimensional electron gas, brought into well defined integer and fractional quantum Hall (QH) states. It can therefore be used for sensitive electrical transport studies, e.g. of excitations and relaxation processes in QH edge states.