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We obtain a class of adiabatic solutions of Dirac equation for the chargedmassless relativistic quasi-particles that arise from the low-energyexcitations \cite{foot-1} in a 2D graphene sheet, interacting with anelectromagnetic field. The analytic solutions obtained are useful for {\itnon-perturbative} investigation of processes in intense laser fields. As afirst example we employ them to predict copious emissions of high orderharmonics by THz lasers interacting with the occupied states of graphinos inthe vicinity of the degenerate Dirac points. The relative intensity of theemitted harmonics is seen to decrease by only about two orders of magnitudefrom the 3rd to the 81st harmonic order, and is characterized by two phenomenaof "revival" and "plateau" formation in the middle and the far end of thespectrum calculated. A preliminary comparison is made for harmonic emissionfrom 2D graphene that reveals a qualitatively different spectrum in the lattercase showing a sharp cutoff at an order $n_{cutoff} = \frac{\omega_B}{\omega}$where $\omega_B=eF_0b/\hbar$ is the so-called Bloch frequency.

Adiabatic solution of Dirac equation of "graphinos" in an intense electromagnetic field and emission of high order harmonics near the Dirac points