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The strong-field interaction of crystal electrons with a low-frequency light wave leads to the emission of ultrabroadband high-order harmonics. The underlying dynamics are investigated in the frequency and in the time domain. An intricate quantum interference involving multiple electronic states in the solid is unraveled.
Dynamical Bloch oscillations and coherent interband polarization in bulk GaSe are controlled by CEP-stable, ultra-intense multi-THz waveforms and result in the emission of phase-stable high-order harmonics covering 12.7 optical octaves from THz to VIS regimes.
We use second harmonic generation to observe an ultrafast magnetic phase transition in MnAs near room temperature following excitation by a 300 fs optical pulse; transition times are on the order of 10 ps.
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