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

by: J. M. Bao, L. N. Pfeiffer, K. W. West, R. Merlin
Physical Review Letters, Vol. 92 (Jun 2004), 236601, doi:10.1103/physrevlett.92.236601  Key: citeulike:11340412

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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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