# Electronic thermal conductivity in 2D topological insulator in a HgTe quantum well

## TL;DR

This paper investigates the electronic thermal conductivity in a 2D topological insulator within a HgTe quantum well by measuring differential resistance and analyzing energy transport along edge modes, confirming the Wiedemann-Franz law.

## Contribution

It provides experimental evidence of thermal transport properties in 2D topological insulators and validates the hot carrier effect model near the charge neutrality point.

## Key findings

- Energy transfer follows Wiedemann-Franz law
- Edge modes facilitate counter propagating energy transport
- Hot carrier effects are significant in 2DTI transport

## Abstract

We have measured the differential resistance in a two-dimensional topological insulator (2DTI) in a HgTe quantum well, as a function of the applied dc current. The transport near the charge neutrality point is characterized by a pair of counter propagating gapless edge modes. In the presence of an electric field, the energy is transported by counter propagating channels in the opposite direction. We test a hot carrier effect model and demonstrate that the energy transfer complies with the Wiedemann Franz law near the charge neutrality point in the edge transport regime.