We investigate the behavior of spin polarized currents in two-dimensional topological insulators (TI). Stationary solutions inside a HgTe/CdTe quantum well (QW) were obtained by Bernevig-Hughes-Zhang (BHZ) model modified by a electric and magnetic barrier inside a non-completely insulating bulk. An attenuated quantum spin Hall (QSH) effect occurs in the gaped region with an apparent Klein-like paradox. Even more interesting, for strong potential regime, the interaction between the quasiparticles and the barriers allows spin inversion of this electronic states in a distinct channel conduction. Thus, our findings suggest a mechanism to manipulated spin polarized currents in this system.
@article{arxiv.1507.04034,
title = {Klein Tunneling of Spin Polarized Currents in HgTe Quantum Wells},
author = {Davidson R. Viana and Thiago M. Melo and Jakson M. Fonseca and Daniel S. Souza and Winder A. Moura-Melo and Afranio R. Pereira},
journal= {arXiv preprint arXiv:1507.04034},
year = {2018}
}