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High-harmonic generation by a laser-driven solid slab is simulated usingtime-dependent density functional theory. Multiple harmonic plateaus up to veryhigh harmonic orders are observed already at surprisingly low field strengths.The full all-electron harmonic spectra are, in general, very different fromthose of any individual Kohn-Sham orbital. Freezing the Kohn-Sham potentialinstead is found to be a good approximation for the laser intensities andharmonic orders considered. The origins of the plateau cutoffs are explained interms of band gaps that can be reached by Kohn-Sham electrons and holes movingthrough the band structure.

High-order harmonic generation in solid slabs beyond the single active electron