Spin conductance of diffusive graphene nanoribbons: a probe of zigzag edge magnetization
Bundesmann, Jan and Liu, Ming-Hao and Adagideli, İnanç and Richter, Klaus (2013) Spin conductance of diffusive graphene nanoribbons: a probe of zigzag edge magnetization. Physical Review B, 88 (19). ISSN 1098-0121 (Print) 1550-235X (Online)
Official URL: http://dx.doi.org/10.1103/PhysRevB.88.195406
We investigate spin transport in diffusive graphene nanoribbons with both clean and rough zigzag edges, and long-range potential fluctuations. The long-range fields along the ribbon edges cause the local doping to come close to the charge neutrality point forming p-n junctions with localized magnetic moments, similar to the predicted magnetic edge of clean zigzag graphene nanoribbons. The resulting random edge magnetization polarizes charge currents and causes sample-to-sample fluctuations of the spin currents obeying universal predictions. We show furthermore that, although the average spin conductance vanishes, an applied transverse in-plane electric field can generate a finite spin conductance. A similar effect can also be achieved by aligning the edge magnetic moments through an external magnetic field.
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