Ferromagnetic barrier induced negative differential conductance on the surface of a topological insulator
Abstract
We theoretically investigate the effect of the negative differential conductance of a ferromagnetic barrier on the surface of a topological insulator. Due to the changes of the shape and position of the Fermi surfaces in the ferromagnetic barrier, the transport processes can be divided into three kinds: the total, partial and blockade transmission mechanisms. The bias voltage can give rise to the transition of the transport processes from partial to blockade transmission mechanisms, which results in a giant effect of negative differential conductance. With appropriate structural parameters, the current-voltage characteristics show that the minimum value of the current can reach to zero in a wide range of the bias voltage, and a large peak-to-valley current ratio can be obtained.
Keywords
Cite
@article{arxiv.1402.2747,
title = {Ferromagnetic barrier induced negative differential conductance on the surface of a topological insulator},
author = {Xing-Tao An},
journal= {arXiv preprint arXiv:1402.2747},
year = {2015}
}
Comments
4 figures