Coherent nonlinear optical response of single quantum dots studied by ultrafast near-field spectroscopy |
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Authors: | Guenther Tobias Lienau Christoph Elsaesser Thomas Glanemann Markus Axt Vollrath Martin Kuhn Tilmann Eshlaghi Soheyla Wieck Andreas D |
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Institution: | Max-Born-Institut für Nichtlineare Optik und Kurzzeitspektroskopie, D-12489 Berlin, Germany. |
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Abstract: | 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. |
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