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Recent studies have demonstrated that the polarization states of highharmonics from solids can differ from those of the driving pulses. To gaininsights on the microscopic origin of this behavior, we perform one-particleintraband-only calculations and reproduce some of the most strikingobservations. For instance, our calculations yield circularly polarizedharmonics from elliptically polarized pulses that sensitively depend on thedriving conditions. Furthermore, we perform experiments on ZnS and find partlysimilar characteristics as reported from silicon. Comparison to ourintraband-only calculations shows reasonable qualitative agreement for abelow-band-gap harmonic. We show that intraband dynamics predict depolarizationeffects for higher field strengths. For harmonics above the band gap, interbanddynamics become important and the high-harmonic response to ellipticalexcitation looks systematically different. Our work proposes a method todistinguish between different high-harmonic generation mechanisms and it couldpave the way to compact solid-state high-harmonic sources with controllablepolarization states.

The role of intraband dynamics in the generation of circularly polarized high harmonics from solids