Quantum transport of pseudospin-polarized Dirac fermions in gapped graphene nanostructures
Abstract
We investigate the unusual features of the quantum transport in gapped monolayer graphene, which is in a pseudospin symmetry-broken state with a net perpendicular pseudomagnetization. Using these pseudoferromagnets (PFs), we propose a perfect pseudospin valve effect that can be used for realizing pseudospintronics in monolayer graphene. The peculiarity of the associated effects of pseudo spin injection and pseudo spin accumulation are also studied. We further demonstrate the determining effect of the sublattice pseudospin degree of freedom on Andreev reflection and the associated proximity effect in hybrid structures of PFs and a superconductor in S/PF and PF/S/PF geometries. In particular, we find a peculiar Andreev reflection that is associated with an inversion of the z component of the carriers pseudospin vector. Our results show that the gapped normal graphene behaves like a ferromagnetic graphene and the effect of the pseudospin degree of freedom in gapped graphene is as important as the spin in a ferromagnetic graphene.
Keywords
Cite
@article{arxiv.1212.4117,
title = {Quantum transport of pseudospin-polarized Dirac fermions in gapped graphene nanostructures},
author = {Leyla Majidi and Malek Zareyan},
journal= {arXiv preprint arXiv:1212.4117},
year = {2013}
}
Comments
19 pages, 10 figures. Accepted for publication in the Journal of Computational Electronics special issue on "Electronic transport in graphene nanostructures and devices". A review of two submissions (arXiv:1208.2461, arXiv:1110.0637) + additional results for the pseudospin injection in pseudoferromaget/normal graphene junctions and the superconducting pseudospin valves