Ultrafast carrier kinetics in exfoliated graphene and thin graphite films

被引：162

作者：

Newson, Ryan W. ^{[1
]}

Dean, Jesse

Schmidt, Ben

van Driel, Henry M.

机构：

[1] Univ Toronto, Dept Phys, Toronto, ON M5S 1A7, Canada

来源：

OPTICS EXPRESS | 2009年 / 17卷 / 04期

基金：

加拿大自然科学与工程研究理事会;

关键词：

EPITAXIAL GRAPHENE; SYSTEMS;

D O I：

10.1364/OE.17.002326

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

Time-resolved transmissivity and reflectivity of exfoliated graphene and thin graphite films on a 295 K SiO2/Si substrate are measured at 1300 nm following excitation by 150 fs, 800 nm pump pulses. From the extracted transient optical conductivity we identify a fast recovery time constant which increases from similar to 200 to 300 fs and a longer one which increases from 2.5 to 5 ps as the number of atomic layers increases from 1 to similar to 260. We attribute the temporal recovery to carrier cooling and recombination with the layer dependence related to substrate coupling. Results are compared with related measurements for epitaxial, multilayer graphene. (C) 2009 Optical Society of America

引用

页码：2326 / 2333

页数：8

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