Femtosecond Population Inversion and Stimulated Emission of Dense Dirac Fermions in Graphene

Details Femtosecond Population Inversion and Stimulated Emission of Dense Dirac Fermions in Graphene Femtosecond Population Inversion and Stimulated Emission of Dense Dirac Fermions in Graphene

2011-12-09

arxiv.org/abs/1112.2204v2

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

Scientific paper

We show that strongly photoexcited graphene monolayers with 35fs pulses quasi-instantaneously build up a broadband, inverted Dirac fermion population. Optical gain emerges and directly manifests itself via a negative optical conductivity for the first 200fs, where stimulated emission completely compensates absorption loss in the graphene layer. Our experiment-theory comparison with two distinct electron and hole chemical potentials reproduce absorption saturation and gain at 40fs, revealing, particularly, the evolution of the transient state from a hot classical gas to a dense quantum fluid with increasing the photoexcitation.

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