Abstract
We review our recent advances in four-wave mixing spectroscopy of single semiconductorquantum dots using heterodyne spectral interferometry, a novel implementation oftransient nonlinear spectroscopy allowing the study of the transient nonlinear polarizationemitted from individual electronic transitions in both amplitude and phase. We presentexperiments on individual excitonic transitions localized in monolayer islands ofGaAs/AlAs quantum wells and in self-assembled CdTe/ZnTe quantum dots. We investigatethe formation of the photon echo from individual transitions, both with increasing numberof transitions in the ensemble, and in the presence of temporal jitter of the energy ofa single transition. The detection of amplitude and phase of the signal allowsthe implementation of a two-dimensional femtosecond spectroscopy, in whichmutual coherent coupling of single quantum dot states can observed and quantified.
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