Floquet-Bloch resonances in near-petahertz electroabsorption spectroscopy of SiO2

Abstract

Complex nonadiabatic dynamics are observed when the quiver energy of an electron-hole pair in a strong laser field becomes comparable to the photon energy. Here, the authors extend quasistatic electromodulation spectroscopy based on the Franz-Keldysh effect to this regime and show that in this limit it is governed by resonant transitions between Floquet-Bloch states. This regime opens opportunities to probe the effective mass as well as the ponderomotive and binding energies of the electron-hole pair on the attosecond timescale.