Population inversion and negative dynamic conductivity in optically pumped graphene

Akira Satou, F. T. Vasko, Taiichi Otsuji, V. Ryzhii

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

We study nonequilibrium carriers (electrons and holes) in an intrinsic graphene at low temperatures under infrared optical pumping. We calculate the energy distributions of carriers using a quasi-classical kinetic equation. It is found that the nonequilibrium distributions are determined by an interplay between weak energy relaxation on acoustic phonons and generation-recombination processes as well as by the effect of pumping saturation. We show that at certain pumping power density the population inversion as well as the dynamic negative conductivity can take place in terahertz and far-infrared frequencies, suggesting the possibility of utilization of graphene under optical pumping for optoelectronic applications, in particular, lasing at such frequencies.

Original languageEnglish
Title of host publicationSISPAD 2009 - 2009 International Conference on Simulation of Semiconductor Processes and Devices
DOIs
Publication statusPublished - 2009 Dec 1
EventSISPAD 2009 - 2009 International Conference on Simulation of Semiconductor Processes and Devices - San Diego, CA, United States
Duration: 2009 Sep 92009 Sep 11

Other

OtherSISPAD 2009 - 2009 International Conference on Simulation of Semiconductor Processes and Devices
CountryUnited States
CitySan Diego, CA
Period09/9/909/9/11

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Computer Science Applications
  • Modelling and Simulation

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