Abstract
Here, we present a study of high-harmonic-generation using the model system of polyacetylene when irradiated with intense laser-field. The system is prepared in a time-periodic Floquet-state. Only odd-order harmonics are obtained within dipole approximation due to the dynamical-symmetry of the Floquet-state. However, odd as well as even-order harmonics are obtained in case of beyond-dipole approximation. Dipole approximation is expected to be valid when the electron during oscillation is confined to a very small region compared to the wavelength of light. However, it is found that the dipole approximation breaks down even if the electron remains delocalised over a region less than 1 nm.
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Mishra, R., Kalita, D. & Gupta, A. Breakdown of dipole approximation and its effect on high harmonic generation. Eur. Phys. J. D 66, 169 (2012). https://doi.org/10.1140/epjd/e2012-20750-0
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DOI: https://doi.org/10.1140/epjd/e2012-20750-0