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

Abstract

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.

References in corpus (9)

• The electronic properties of graphene
• Universal Dynamic Conductivity and Quantized Visible Opacity of Suspended Graphene
• Measurement of the Optical Conductivity of Graphene
• Ultrafast Photoluminescence from Graphene
• Atomic Hole Doping of Graphene
• Quantum critical transport in clean graphene
• Slow imbalance relaxation and thermoelectric transport in graphene
• Fluorescence of laser created electron-hole plasma in graphene
• Broadband electromagnetic response and ultrafast dynamics of few-layer epitaxial graphene

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