Light-induced valley currents and magnetization in graphene rings

Details Light-induced valley currents and magnetization in graphene rings Light-induced valley currents and magnetization in graphene rings

2009-10-10

arxiv.org/abs/0910.1950v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 2 figures, submitted to Phys. Rev. B

Scientific paper

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.

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