Second harmonic generation in graphene dressed by a strong terahertz field

Abstract

We observe enhanced second-harmonic generation in monolayer graphene in the presence of an ultra-strong terahertz field pulse with a peak amplitude of 250 kV/cm. This is a strongly nonperturbative regime of light-matter interaction in which particles get accelerated to energies exceeding the initial Fermi energy of 0.2 eV over a timescale of a few femtoseconds. The second-harmonic current is generated as electrons drift through the region of momenta corresponding to interband transition resonance at an optical frequency. The resulting strongly asymmetric distortion of carrier distribution in momentum space gives rise to an enhanced electric-dipole nonlinear response at the second harmonic. We develop an approximate analytic theory of this effect which accurately predicts observed intensity and polarization of the second-harmonic signal.

References in corpus (10)

• Nonlinear electromagnetic response of graphene: Frequency multiplication and the self-consistent-field effects
• Non-linear electromagnetic response of graphene
• Third harmonic generation in graphene and few-layer graphite films
• Generation of entangled photons in graphene in a strong magnetic field
• Superradiant Decay of Cyclotron Resonance of Two-Dimensional Electron Gases
• Second-order nonlinear optical response of graphene
• Second order optical nonlinearity of graphene due to electric quadrupole and magnetic dipole effects
• Theory of resonant photon drag in monolayer graphene
• Continuous wave lasing between Landau levels in graphene
• Nonlinear electromagnetic response of a uniform electron gas

Cited by in corpus (3)

• Parametric Nonlinear Optics with Layered Materials and Related Heterostructures
• Anisotropic ultrafast optical response of terahertz pumped graphene
• Symmetry breaking driven by petahertz electron acceleration in a centrosymmetric organic superconductor