Regensburg 2013 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 26: Transport: Graphene - Electronic Properties and Transport 2 (jointly with DS, HL, MA, and TT)
O 26.7: Vortrag
Dienstag, 12. März 2013, 11:15–11:30, H17
Spin conductance of diffusive graphene nanoribbons — •Jan Bundesmann1, Ming-Hao Liu1, Inanc Adagideli2, and Klaus Richter1 — 1University of Regensburg, Regensburg, Germany — 2Sabanci University, Istanbul, Turkey
Graphene, when cut along a zigzag edge, shows a strongly increased density of states at energies close to the charge neutrality point. The electron states that are the source of this increased DOS are pseudospin-polarized, i.e. they occupy mainly one sublattice, while their wavefunction decays exponentially from the zigzag edge.
In such systems one expects magnetic ordering which anifests as an antiferromagnetic alignment of the two sublattices. Due to the pseudospin polarization of the states finite local magnetic moments appear along the edges.
We investigate how the formation of these local magnetic moments influences charge and spin transport in graphene. It will be shown how this can lead to a finite spin conductance of a single graphene nanoribbon and that within the localized transport regime the spin conductance fluctuations exhibit universal behaviour in the sense that they don't depend on the exact modelling of the magnetization and even a large amount of edge roughness does not lead to deviations from this universal behaviour.