Efficient high-harmonic generation in graphene with two-color laser field at orthogonal polarization

Abstract

High-order frequency mixing in graphene using a two-color radiation field consisting of the fundamental and the second harmonic fields of an ultrashort linearly polarized laser pulse is studied. It is shown that the harmonics originated from the interband transitions are efficiently generated in the case of the orthogonally polarized two-color field. In this case, the generated high-harmonics are stronger than those obtained in the parallel polarization case by more than two orders of magnitude. This is in sharp contrast with the atomic and semiconductor systems, where parallel polarization case is more preferable. The physical origin of this enhancement is also deduced from the three-step semi-classical electron-hole collision model, extended to graphene with pseudo-relativistic energy dispersion. In particular, we discuss the influence of the many particle Coulomb interaction on the HHG process within dynamical Hartree-Fock approximation. Our analysis shows that in all cases we have an overall enhancement of the HHG signal compared with the free-charged carrier model due to the electron-hole attractive interaction.

arXiv comment12 pages, 9 figures

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Cited by in corpus (8)

• Photocurrent generation in solids via linearly polarized laser
• The saddle-point exciton signature on high harmonic generation in 2D hexagonal nanostructures
• Multiphoton excitation and high harmonic generation in rectangular graphene quantum dot
• Berry curvature and shift vector effects at high-order wave mixing in biased bilayer graphene
• Two-color laser control of photocurrent and high harmonics in graphene
• Noncollinear phase-matching of high harmonic generation in solids
• Graphene valley polarization as a function of carrier-envelope phase in few-cycle laser pulses and its footprints in harmonic signals
• Nonlinear Optical Spectroscopy of Nodal-Line Semimetals