Ultrafast Optical-Pump Terahertz-Probe Spectroscopy of the Carrier Relaxation and Recombination Dynamics in Epitaxial Graphene

被引：544

作者：

George, Paul A. ^{[1
]}

Strait, Jared ^{[1
]}

Dawlaty, Jahan ^{[1
]}

Shivaraman, Shriram ^{[1
]}

Chandrashekhar, Mvs ^{[1
]}

Rana, Farhan ^{[1
]}

Spencer, Michael G. ^{[1
]}

机构：

[1] Cornell Univ, Sch Elect & Comp Engn, Ithaca, NY 14853 USA

来源：

NANO LETTERS | 2008年 / 8卷 / 12期

基金：

美国国家科学基金会;

关键词：

D O I：

10.1021/nl8019399

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

The ultrafast relaxation and recombination dynamics of photogenerated electrons and holes in epitaxial graphene are studied using optical-pump terahertz-probe spectroscopy. The conductivity in graphene at terahertz frequencies depends on the carrier concentration as well as the carrier distribution in energy. Time-resolved studies of the conductivity can therefore be used to probe the dynamics associated with carrier intraband relaxation and interband recombination. We report the electron-hole recombination times in epitaxial graphene for the first time. Our results show that carrier cooling occurs on subpicosecond time scales and that interband recombination times are carrier density dependent.

引用

页码：4248 / 4251

页数：4

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