Tuning the delay between orthogonally polarized pulses drives harmonic helicity in solids from linear to circular, independent of crystal symmetry, due to sub-cycle dipole coupling.
Vanderbilt,Berry phases in electronic structure the- ory: electric polarization, orbital magnetization and topo- logical insulators(Cambridge University Press, 2018)
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Field-driven helicity in solid-state high-harmonic generation
Tuning the delay between orthogonally polarized pulses drives harmonic helicity in solids from linear to circular, independent of crystal symmetry, due to sub-cycle dipole coupling.