Hot carrier diffusion in graphene

被引：91
作者：
Ruzicka, Brian A. [1 ]
Wang, Shuai [2 ]
Werake, Lalani K. [1 ]
Weintrub, Ben [1 ]
Loh, Kian Ping [2 ]
Zhao, Hui [1 ]
机构：
[1] Univ Kansas, Dept Phys & Astron, Lawrence, KS 66045 USA
[2] Natl Univ Singapore, Dept Chem, Singapore 117543, Singapore
来源：
PHYSICAL REVIEW B | 2010年 / 82卷 / 19期
基金：
美国国家科学基金会;
关键词：
PHOTOEXCITED CARRIERS; EPITAXIAL GRAPHENE; HIGH-MOBILITY; BERRYS PHASE; TRANSPORT; SPECTROSCOPY; CONFINEMENT; DYNAMICS;
D O I：
10.1103/PhysRevB.82.195414
中图分类号：
T [工业技术];
学科分类号：
08 ;
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.
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页数：5
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