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Ultrafast Dynamic Control of Spin and Charge Density Oscillations in a GaAs Quantum Well

J. M. Bao·L. N. Pfeiffer·K. W. West·R. Merlin
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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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J. M. Bao, L. N. Pfeiffer, K. W. West, R. Merlin. 2003-10-06. Ultrafast Dynamic Control of Spin and Charge Density Oscillations in a GaAs Quantum Well. https://doi.org/10.1103/physrevlett.92.236601

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