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.
@article{arxiv.1901.10297,
title = {Electronic thermal conductivity in 2D topological insulator in a HgTe quantum well},
author = {G. M. Gusev and Z. D. Kvon and A. D. Levin and E. B. Olshanetsky and O. E. Raichev and N. N. Mikhailovand and S. A. Dvoretsky},
journal= {arXiv preprint arXiv:1901.10297},
year = {2019}
}