Hot carrier diffusion in graphene

Article

关键词: PHOTOEXCITED CARRIERS;    EPITAXIAL GRAPHENE;    HIGH-MOBILITY;    BERRYS PHASE;    TRANSPORT;    SPECTROSCOPY;    CONFINEMENT;    DYNAMICS;   

DOI  :  10.1103/PhysRevB.82.195414

来源: SCIE

【 摘 要 】

We report an optical study of charge transport in graphene. Diffusion of hot carriers in epitaxial graphene and reduced graphene-oxide samples are studied using an ultrafast pump-probe technique with a high spatial resolution. Spatiotemporal dynamics of hot carriers after a pointlike excitation are monitored. Carrier-diffusion coefficients of 11 000 and 5500 cm(2) s(-1) are measured in epitaxial graphene and reduced graphene-oxide samples, respectively, with a carrier temperature on the order of 3600 K. The demonstrated optical techniques can be used for noncontact and noninvasive in situ detection of transport properties of graphene.

【 授权许可】

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