Phys. Rev. Lett. 89, 057401 (2002) [4 pages]Coherent Nonlinear Optical Response of Single Quantum Dots Studied by Ultrafast Near-Field SpectroscopySee Also: Erratum Received 21 February 2002; published 15 July 2002 The nonlinear response of single GaAs quantum dots is studied in femtosecond near-field pump-probe experiments. At negative time delays, transient reflectivity spectra show pronounced oscillatory structure around the quantum dot exciton line, providing the first evidence for a perturbed free induction decay of the excitonic polarization. Phase-disturbing Coulomb interactions between the excitonic polarization and continuum excitations dominate the optical nonlinearity on ultrafast time scales. A theoretical analysis based on the semiconductor Bloch equations accounts for this behavior. © 2002 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.89.057401
DOI:
10.1103/PhysRevLett.89.057401
PACS:
78.67.Hc, 07.79.Fc, 78.47.+p
See AlsoErratum: Tobias Guenther, Christoph Lienau, Thomas Elsaesser, Markus Glanemann, Vollrath Martin Axt, Tilmann Kuhn, Soheyla Eshlaghi, and Andreas D. Wieck, Erratum: Coherent Nonlinear Optical Response of Single Quantum Dots Studied by Ultrafast Near-Field Spectroscopy [Phys. Rev. Lett. 89, 057401 (2002)], Phys. Rev. Lett. 89, 179901 (2002). Reply: T. Guenther, C. Lienau, T. Elsaesser, M. Glanemann, V. M. Axt, and T. Kuhn, Guenther et al. Reply:, Phys. Rev. Lett. 90, 139702 (2003). Reply: M. Joffre, Comment on “Coherent Nonlinear Optical Response of Single Quantum Dots Studied by Ultrafast Near-Field Spectroscopy”, Phys. Rev. Lett. 90, 139701 (2003). |
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