Multiphoton excitation and high-harmonics generation in topological insulator

Abstract

Multiphoton interaction of coherent electromagnetic radiation with 2D metallic carriers confined on the surface of the 3D topological insulator is considered. A microscopic theory describing the nonlinear interaction of a strong wave and metallic carriers with many-body Coulomb interaction is developed. The set of integrodifferential equations for the interband polarization and carrier occupation distribution is solved numerically. Multiphoton excitation of Fermi-Dirac sea of 2D massless carriers is considered for a THz pump wave. It is shown that in the moderately strong pump wave field along with multiphoton interband/intraband transitions the intense radiation of high harmonics takes place.

13 pages, 7 figures

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• Nonlinear optical response of doped mono- and bilayer graphene: length gauge tight-binding model
• High-order harmonic generation in solid ${\mathbf{C}}_{60}$
• Second and third harmonics generation by coherent sub-THz radiation at induced Lifshitz transitions in gapped bilayer graphene
• Induced by coherent THz-radiation high harmonics generation in bilayer graphene at high Fermi energies