Population inversion in Landau-quantized graphene

Abstract

Landau level lasers have the advantage of tunability of the laser frequency by means of the external magnetic field. The crucial prerequisite of such a laser is a population inversion between optically coupled Landau levels. Efficient carrier-carrier and carrier-phonon scattering generally suppresses this effect in conventional materials. Based on microscopic calculations, we predict for the first time the occurrence of a long-lived population inversion in Landau-quantized graphene and reveal the underlying many-particle mechanisms. To guide the experimental demonstration, we present optimal conditions for the observation of a maximal population inversion in terms of experimentally accessible parameters, such as the strength of the magnetic field, pump fluence, temperature, and doping. We reveal that in addition to the tunability of the Landau-level laser frequency, also the polarization of the emitted light can be tuned via gate voltage controlling the doping of the sample.

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Cited by in corpus (15)

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• Suppressed Auger scattering and tunable light emission of Landau-quantized massless Kane electrons
• Carrier dynamics in graphene: ultrafast many-particle phenomena
• Graphene as Gain Medium for Broadband Lasers
• Coherent nonlinear optical response of graphene in the quantum Hall regime
• High harmonic generation in Landau-quantized graphene subjected to a strong electromagnetic radiation
• Photo-thermoelectric detection of cyclotron resonance in asymmetrically carrier-doped graphene two-terminal device
• Terahertz cyclotron emission from two-dimensional Dirac fermions
• Proposal for a tunable graphene-based terahertz Landau-level laser
• High-Order Multipole Radiation from Quantum Hall States in Dirac Materials
• Triaxially strained suspended graphene for large-area pseudo-magnetic fields
• Gate tunable terahertz cyclotron emission from two-dimensional Dirac fermions
• Topological interface states -- a possible path towards a Landau-level laser in the THz regime
• Cyclotron Resonance Gain for FIR and THz Radiation in Graphene
• Photoinduced polarization enhancement in biased bilayer graphene in the Landau level regime