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Ultrafast dynamic control of spin and charge density oscillations in a GaAs quantum well
J M Bao1, L N Pfeiffer, K W West
1Focus Center and Department of Physics, The University of Michigan, Ann Arbor, Michigan 48109-1120, USA.
Abstract:
We use subpicosecond laser pulses to generate and monitor in real time collective oscillations of electrons in a modulation-doped GaAs quantum well. The observed frequencies match those of intersubband spin- and charge-density excitations. Light couples to coherent density fluctuations through resonant stimulated Raman scattering. Because the spin- and charge-related modes obey different selection rules and resonant behavior, the amplitudes of the corresponding oscillations can be independently controlled by using shaped pulses of the proper polarization.
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