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.

引用

页数：5

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