Coherent Nonlinear Optical Response of Single Quantum Dots Studied by Ultrafast Near-Field Spectroscopy

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Guenther, Tobias ; Lienau, Christoph ; Elsaesser, Thomas ; Glanemann, Markus ; Axt, Vollrath Martin ; Kuhn, Tilmann ; Eshlaghi, Soheyla ; Wieck, Andreas D.:
Coherent Nonlinear Optical Response of Single Quantum Dots Studied by Ultrafast Near-Field Spectroscopy.
In: Physical Review Letters. Vol. 89 (2002) Issue 5 . - No. 057401.
ISSN 1079-7114
DOI: https://doi.org/10.1103/PhysRevLett.89.057401

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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.