期刊
PHYSICAL REVIEW B
卷 84, 期 19, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.84.195408
关键词
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资金
- Russian Foundation for Basic Research
- President grant for young scientists
- Dynasty Foundation
- International Center for Fundamental Physics in Moscow
We show that the optical excitation of graphene with polarized light leads to pure valley current for which carriers in the valleys counterflow. The current in each valley originates from the asymmetry of optical transitions and electron scattering by impurities owing to the warping of the electron energy spectrum. The valley current has strong polarization dependence; its direction is opposite for normally incident beams of orthogonal linear polarizations. In undoped graphene on a substrate with high susceptibility, electron-electron scattering leads to an additional contribution to the valley current that can dominate.
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