Light-induced valley currents and magnetization in graphene rings
arXiv:0910.1950 · doi:10.1103/PhysRevB.80.193407
Abstract
We study the non-equilibrium dynamics in a mesoscopic graphene ring excited by picoseconds shaped electromagnetic pulses. We predict an ultrafast buildup of charge polarization, currents and orbital magnetization. Applying the light pulses identified here, non-equilibrium valley currents are generated in a graphene ring threaded by a stationary magnetic flux. We predict a finite graphene ring magnetization even for a vanishing charge current; the magnetization emerges due to the light-induced difference of the valley populations.
4 pages, 2 figures, submitted to Phys. Rev. B
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