Multiband Dynamics of Extended Harmonic Generation in Solids under Ultraviolet Injection

Using one-dimensional semiconductor Bloch equations, we investigate the multiband dynamics of electrons in a cutoff extension scheme employing an infrared pulse with additional UV injection. An extended three-step model is firstly validated to play dominant role emitting harmonics second plateau. Surprisingly, further analysis acceleration theorem shows that, though both primary and secondary present positive negative chirps, (negative) chirp first region related so-called short (long) trajectory, while that emitted through ‘general’ where tunneling earlier recombining contribute significantly. The novel characteristics deepen understanding high harmonic generation solids may have great significance attosecond science reconstruction band dispersion beyond edge.