Broadband electromagnetic response and ultrafast dynamics of few-layer epitaxial graphene
Broadband electromagnetic response and ultrafast dynamics of few-layer epitaxial graphene
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DOI：
10.1063/1.3122348
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发表时间：
2009-04-27
影响因子：
4
通讯作者：
Kaindl, R. A.
中科院分区：
文献类型：
--
作者：
Choi, H.;Borondics, F.;Kaindl, R. A.
我们研究了外延石墨烯在少层极限下的宽带光电导和超快载流子动力学。名义上的缓冲，单层和多层石墨烯的平衡光谱表现出显着的太赫兹和近红外吸收，在一个致密的狄拉克电子等离子体的带内和带间跃迁的模型一致。光激发后的非平衡太赫兹传输的变化被证明是占主导地位的过剩空穴载流子，与1.2 ps的单指数衰减，反映了少数载流子复合时间。
We study the broadband optical conductivity and ultrafast carrier dynamics of epitaxial graphene in the few-layer limit. Equilibrium spectra of nominally buffer, monolayer, and multilayer graphene exhibit significant terahertz and near-infrared absorption, consistent with a model of intra- and interband transitions in a dense Dirac electron plasma. Nonequilibrium terahertz transmission changes after photoexcitation are shown to be dominated by excess hole carriers, with a 1.2 ps monoexponential decay that reflects the minority-carrier recombination time.