Static quantum dot on a potential hilltop for generating and analyzing hot electrons in the quantum Hall regime

TL;DR

This paper introduces a static quantum dot on a potential hilltop to generate and analyze high-energy hot electrons in a quantum Hall system, enabling detailed study of electron dynamics and energy relaxation.

Contribution

It presents a novel static quantum dot design for hot electron generation and analysis in quantum Hall edge channels, with high energy resolution for studying electron interactions.

Findings

Demonstrated generation of ballistic hot electrons above the chemical potential.

Analyzed spectral diffusion and energy relaxation of hot electrons.

Estimated maximum energy exchange per scattering event.

Abstract

We propose and demonstrate a static quantum dot on a potential hilltop to generate and analyze ballistic hot electrons along a quantum Hall edge channel well above the chemical potential. High energy resolution associated with discrete energy levels is attractive for studying hot-electron dynamics. Particularly, the energy distribution function of hot electrons weakly coupled to cold electrons is investigated to reveal spectral diffusion with energy relaxation. The analysis allows us to estimate the maximum energy exchange per scattering, which is an important parameter to describe interacting electrons in the edge channel.