Negative dynamic conductivity of graphene with optical pumping

被引：300
|
作者：
Ryzhii, V. [1 ]
Ryzhii, M.
Otsuji, T.
机构：
[1] Univ Aizu, Comp Solid State Phys Lab, Aizu Wakamatsu 9658580, Japan
[2] Tohoku Univ, Res Inst Elect Commun, Sendai, Miyagi 9808577, Japan
来源：
JOURNAL OF APPLIED PHYSICS | 2007年 / 101卷 / 08期
关键词：
D O I：
10.1063/1.2717566
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
We study the dynamic ac conductivity of a nonequilibrium two-dimensional electron-hole system in optically pumped graphene. Considering the contribution of both interband and intraband transitions, we demonstrate that at sufficiently strong pumping the population inversion in graphene can lead to the negative net ac conductivity in the terahertz range of frequencies. This effect might be used in graphene-based coherent sources of terahertz radiation. (c) 2007 American Institute of Physics.
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页数：4
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