Transient nonlinear optical spectroscopy studies involving biexciton coherence in single quantum dots

摘要

Transient differential transmission measurements were performed to study coherent dynamics involving the biexciton resonance confined in a single GaAs quantum dot. When laser pulses with sufficient bandwidth were tuned to cover both the exciton and biexciton transitions, an oscillatory behavior in the probe transmission was observed. These oscillations persist only as long as the pump and probe pulses overlap in time, in contrast to the usual quantum beat phenomena.