Impact of electron-electron Coulomb interaction on the high harmonic generation process in graphene

Abstract

Generation of high harmonics in a monolayer graphene initiated by strong coherent radiation field, taking into account electron-electron Coulomb interaction is investigated. A microscopic theory describing the nonlinear optical response of graphene is developed. The Coulomb interaction of electrons is treated in the scope of dynamic Hartree-Fock approximation. The closed set of integrodifferential equations for the single-particle density matrix of a graphene quantum structure is solved numerically. The obtained solutions show the significance of many-body Coulomb interaction on the high harmonic generation process in graphene.

10 pages, 12 figures

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• On the extreme nonlinear optics of graphene nanoribbons in the strong coherent radiation fields
• Third harmonic generation of undoped graphene in Hartree-Fock approximation
• Microscopic quantum description of second-order nonlinearities in 2D hexagonal nanostructures beyond the Dirac cone approximation
• Graphene valley polarization as a function of carrier-envelope phase in few-cycle laser pulses and its footprints in harmonic signals
• Second and third harmonics generation by coherent sub-THz radiation at induced Lifshitz transitions in gapped bilayer graphene
• Nonlinear Optical Spectroscopy of Nodal-Line Semimetals
• High harmonic generation in fullerene molecules
• Induced by coherent THz-radiation high harmonics generation in bilayer graphene at high Fermi energies