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Yan B.,Peking University | Yan B.,Collaborative Innovation Center on Quantum Matter | Han Q.,Peking University | Han Q.,Collaborative Innovation Center on Quantum Matter | And 10 more authors.
Physical Review B - Condensed Matter and Materials Physics | Year: 2016

We study the intervalley scattering in defected graphene by low-temperature transport measurements. The scattering rate is strongly suppressed when defects are charged. This finding highlights "screening" of the short-range part of a potential by the long-range part. Experiments on calcium-adsorbed graphene confirm the role of a long-range Coulomb potential. This effect is applicable to other multivalley systems, provided that the charge state of a defect can be electrically tuned. Our result provides a means to electrically control valley relaxation and has important implications in valley dynamics in valleytronic materials. © 2016 American Physical Society.

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