Population dynamics in graphene under femtosecond chirped pulse excitation

DING Chunling; YU Rong; LI Ruoping; ZHANG Duo

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Population dynamics in graphene under femtosecond chirped pulse excitation

DING Chunling 1 * #,YU Rong 1,LI Ruoping 2,ZHANG Duo 3

1.School of Science, Wuhan Institute of Technology, Wuhan 430205

2.School of Physics and Electronics, Henan University, Kaifeng 475004

3.School of Electrical and Electronic Engineering, Wuhan Polytechnic University, Wuhan 430023

*Correspondence author

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Funding: National Natural Science Foundation of China （No.U1504111, 11505131, 11404250）, Doctoral Program of Higher Education of China （No.20134103120005）

Opened online:27 April 2017

Accepted by: none

Citation: DING Chunling,YU Rong,LI Ruoping.Population dynamics in graphene under femtosecond chirped pulse excitation[OL]. [27 April 2017] http://en.paper.edu.cn/en_releasepaper/content/4726361

We present, within a femtosecond time scale, a scheme for studying the fast population dynamics of graphene under a few-cycle chirped pulse excitation. Based on the density-matrix formalism, the time-dependent differential equations are derived which can be used to describe the carrier dynamics in graphene. We find that the ultrafast transfer of population between electronic states in both valence and conduction bands becomes possible due to the combined interband and intraband transitions. Also, a complete population inversion can be obtained under appropriate conditions. These dynamical behaviors can be controlled by choosing suitable values of chirped parameter as well as the intensities of laser pulse and the applied magnetic field. Our investigations have potential applications in the design of graphene-based ultrafast electronic and optoelectronic devices.

Keywords:Population dynamics; Ultrafast transfer; Population inversion; Graphene; Few-cycle chirped pulse

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