We have investigated the intraband dynamics of non-equilibrium carriers in semiconductors, using a picosecond far-infrared (FIR) free-electron laser synchronized with a femtosecond near-infrared (NIR) Ti : sapphire laser. An intense NIR pulse creates carriers, which interact with a delayed FIR pulse. We detect time-resolved cyclotron resonance by monitoring the intensity of the transmitted and reflected FIR pulse as functions of magnetic field and time delay between the NIR and FIR pulses. Results reveal a variety of intraband dynamical phenomena over time scales much shorter than the interband lifetime.
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Mitchell et al. (1999) studied this question.
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