Thermal Transport Imaging in the Quantum Hall Edge Channel

TL;DR

This paper introduces a new method to map heat transport in quantum Hall edge channels, providing insights into energy dissipation mechanisms and thermal decay length, which are crucial for understanding edge state physics.

Contribution

A novel experimental technique for local heating and temperature detection in quantum Hall edge channels to study heat dissipation and thermal decay length.

Findings

Measured the thermal decay length of the edge state.

Provided experimental data on heat dissipation mechanisms.

Enhanced understanding of energy loss in quantum Hall edge channels.

Abstract

Research focused on heat transport in the quantum Hall (QH) edge channel has successfully addressed fundamental theoretical questions surrounding the QH physics. However, the picture of the edge channel is complicated by the phenomenon of energy dissipation out of the edge, and theories treating this dissipation are lacking. More experimental data is also needed to determine the coupling mechanism by which energy leaves the edge channel. We developed a method to map the heat transport in the QH edge to study the dissipation of heat. We locally heated the QH edge and locally detected the temperature increase while continuously varying the distance between heater and thermometer. We thereby obtained the thermal decay length of the edge state.