2009/10/10 by A. S. Moskalenko, Jamal Berakdar, J. Berakdar
Materials Science · Physics and Astronomy · #Graphene research and applications #Quantum and electron transport phenomena #Quantum optics and atomic interactions #cond-mat.mes-hall
paper · pdf · doi:10.1103/physrevb.80.193407
4 pages, 2 figures, submitted to Phys. Rev. B
arxiv created 2009/10/10 · openalex publication_date 2009/11/12 · arxiv updated 2012/07/02 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
We study the nonequilibrium 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, nonequilibrium 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.