We demonstrate that a p-n junction created electrically in HgTe quantum wells with inverted band-structure exhibits interesting intraband and interband tunneling processes. We find a perfect intraband transmission for electrons injected perpendicularly to the interface of the p-n junction. The opacity and transparency of electrons through the p-n junction can be tuned by changing the incidence angle, the Fermi energy and the strength of the Rashba spin-orbit interaction. The occurrence of a conductance plateau due to the formation of topological edge states in a quasi-one-dimensional p-n junction can be switched on and off by tuning the gate voltage. The spin orientation can be substantially rotated when the samples exhibit a moderately strong Rashba spin-orbit interaction.
@article{arxiv.0912.3327,
title = {Quantum tunneling through planar p-n junctions in HgTe quantum wells},
author = {L. B. Zhang and Kai Chang and X. C. Xie and H. Buhmann and L. W. Molenkamp},
journal= {arXiv preprint arXiv:0912.3327},
year = {2015}
}