We theoretically study the occurrence of Bloch oscillations in biased hybrid graphene systems with spin-dependent superlattices. The spin-dependent potential is realized by a set of ferromagnetic insulator strips deposited on top of a gapped graphene nanoribbon, which induce a proximity exchange splitting of the electronic states in the graphene monolayer. We numerically solve the Dirac equation and study Bloch oscillations in the lowest conduction band of the spin-dependent superlattice. While the Bloch frequency is the same for both spins, we find the Bloch amplitude to be spin dependent. This difference results in a spin-polarized ac electric current in the THz range.
@article{arxiv.1407.0651,
title = {Spin-dependent THz oscillator based on hybrid graphene superlattices},
author = {E. Díaz and K. Miralles and F. Domínguez-Adame and C. Gaul},
journal= {arXiv preprint arXiv:1407.0651},
year = {2014}
}