Population inversion of photoexcited electrons and holes in graphene and its negative terahertz conductivity

Victor Ryzhii, Maxim Ryzhii, Taiichi Otsuji

Research output: Contribution to journalConference article

20 Citations (Scopus)

Abstract

We demonstrate that sufficiently strong optical excitation may result in the population inversion in graphene, so that the real part of the ac conductivity can be negative in the terahertz range of frequencies. We study also how the heating of the electron-hole system influences the effect of negative ac conductivity. The effect of population inversion and negative ac conductivity might be used in graphene-based coherent sources of terahertz electromagnetic radiation.

Original languageEnglish
Pages (from-to)261-264
Number of pages4
JournalPhysica Status Solidi (C) Current Topics in Solid State Physics
Volume5
Issue number1
DOIs
Publication statusPublished - 2008 Jun 30
Event15th International Conference on Nonequilibrium Carrier Dynamics in Semiconductors, HCIS15 - Tokyo, Japan
Duration: 2007 Jul 232007 Jul 27

ASJC Scopus subject areas

  • Condensed Matter Physics

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