Light-induced valley currents and magnetization in graphene rings

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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.
Publisher
AMER PHYSICAL SOC
Issue Date
2009-11
Language
English
Article Type
Article
Citation

PHYSICAL REVIEW B, v.80, no.19

ISSN
1098-0121
DOI
10.1103/PhysRevB.80.193407
URI
http://hdl.handle.net/10203/261900
Appears in Collection
PH-Journal Papers(저널논문)
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