Impulsive excitation of cyclotron oscillations in a two-dimensional electron gas
نویسندگان
چکیده
We report on the impulsive excitation and control of intersubband and hybrid intersubband-cyclotron modes in a twodimensional electron gas by ultrafast optical pulses. Pump-probe experiments were performed in the reflection geometry on a modulation-doped GaAs/AlxGa1KxAs quantum well at 7 K. Using a pulse shaper to produce multiple excitation pulses, we demonstrate coherent control of charge-density intersubband modes. When a tilted magnetic field is applied, we observe oscillations due to hybrid intersubband-cyclotron modes. The features observed in the pump-probe experiments are consistent in frequency and selection rules with spontaneous Raman scattering data obtained from the same sample. q 2005 Elsevier Ltd. All rights reserved. PACS: 73.21.Fg; 76.40.Cb; 42.65.Re
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