Helical edge resistance introduced by charge puddles
Mesoscale and Nanoscale Physics
2013-10-25 v1 Disordered Systems and Neural Networks
Abstract
We study the influence of electron puddles created by doping of a 2D topological insulator on its helical edge conductance. A single puddle is modeled by a quantum dot tunnel-coupled to the helical edge. It may lead to significant inelastic backscattering within the edge because of the long electron dwelling time in the dot. We find the resulting correction to the perfect edge conductance. Generalizing to multiple puddles, we assess the dependence of the helical edge resistance on temperature and doping level, and compare it with recent experimental data.
Cite
@article{arxiv.1303.1766,
title = {Helical edge resistance introduced by charge puddles},
author = {Jukka I. Väyrynen and Moshe Goldstein and Leonid I. Glazman},
journal= {arXiv preprint arXiv:1303.1766},
year = {2013}
}
Comments
5 pages, 1 figure