Journal
JOURNAL OF COMPUTATIONAL ELECTRONICS
Volume 12, Issue 2, Pages 134-144Publisher
SPRINGER
DOI: 10.1007/s10825-013-0444-0
Keywords
Sublattice pseudospin; Gapped graphene; Pseudospin valve; Superconducting proximity effect; Andreev reflection
Funding
- Institute for Advanced Studies in Basic Sciences (IASBS) Research Council [G2009IASBS110, G2010IASBS110]
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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 pseudospin injection and pseudospin 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.
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