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Hot carrier diffusion in graphene
Ruzicka, Brian Andrew Wang, Shuai Werake, Lalani Kumari Weintrub, Ben Loh, Kian Ping Zhao, Hui
Ruzicka, Brian Andrew
Wang, Shuai
Werake, Lalani Kumari
Weintrub, Ben
Loh, Kian Ping
Zhao, Hui
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Abstract
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 point-like excitation are monitored. Carrier diffusion coefficients of 11,000 and 5,500 squared centimeters per second are measured in epitaxial graphene and reduced graphene oxide samples, respectively, with a carrier temperature on the order of 3,600 K. The demonstrated optical techniques can be used for non-contact and non-invasive in-situ detection of transport properties of graphene.
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Date
2010-11
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American Physical Society
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Mesoscale and Nanoscale Physics, Materials Science
Citation
B.A. Ruzicka, S. Wang, L.K. Werake, B. Weintrub, K.P. Loh, and Hui Zhao, Hot carrier diffusion in graphene, Physical Review B, 82, 195414 (2010). http://link.aps.org/doi/10.1103/PhysRevB.82.195414