Phys. Rev. Lett. 92, 236601 (2004) [4 pages]Ultrafast Dynamic Control of Spin and Charge Density Oscillations in a GaAs Quantum WellReceived 6 October 2003; published 8 June 2004 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. © 2004 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.92.236601
DOI:
10.1103/PhysRevLett.92.236601
PACS:
72.25.Fe, 42.65.Dr, 73.21.Fg, 78.47.+p
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