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Electrical control of intervalley scattering in graphene via the charge state of defects

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.

preprint2016arXivOpen access
Baoming YanQi HanZhenzhao JiaJingjing NiuTuocheng CaiDapeng YuXiaosong Wu
cond-mat.mes-hall
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Open access7 authors1 topic
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Baoming YanQi HanZhenzhao JiaJingjing NiuTuocheng CaiDapeng YuXiaosong Wu

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