Dresden 2011 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 8: TR: Graphene 2 (jointly with MA, HL, and DY)
TT 8.7: Talk
Monday, March 14, 2011, 15:45–16:00, HSZ 304
Graphene-based electronic spin lenses — •Ali G. Moghaddam1 and Malek Zareyan2 — 1Theoretische Physik, Universität Duisburg-Essen, 47048 Duisburg, Germany — 2Institute for Advanced Studies in Basic Sciences (IASBS), P.O. Box 45195-1159, Zanjan, Iran
We have proposed a solid state electronic spin lens based on a ferromagnetic graphene which has an exchange potential higher than its Fermi energy. The key property is that an interface between such a spin-chiral ferromagnetic (FM) and a nomal (N) graphene region exhibits a negative electronic refractive index which has different signs for electrons with different spin-directions. We have shown that in a corresponding N-FM-N structure, an unpolarized electronic beam can be collimated with a finite spin-polarization producing a point spin accumulation with associated Friedel-like oscillations of spin-dependent local density of states. In this respect, our study reveals that magnetic graphene has the potential to be the electronic counterpart of the recently discovered photonic chiral metamaterials which exhibit a negative refractive index for only one direction of the circular polarization of the electromagnetic wave.
A. G. Moghaddam and M. Zareyan, Phys. Rev. Lett. 105, 146803 (2010).