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We present both experimental and theoretical investigations of a laser-drivenquantum dot (QD) in the dressed-state regime of resonance fluorescence. Weexplore the role of phonon scattering and pure dephasing on thedetuning-dependence of the Mollow triplet and show that the triplet sidebandsmay spectrally broaden or narrow with increasing detuning. Based on a polaronmaster equation approach which includes electron-phonon interactionnonperturbatively, we derive a fully analytical expression for the spectrum.With respect to detuning dependence, we identify a crossover between theregimes of spectral sideband narrowing or broadening. A comparison of thetheoretical predictions to detailed experimental studies on the laserdetuning-dependence of Mollow triplet resonance emission from single In(Ga)AsQDs reveals excellent agreement.

Detuning-Dependent Mollow Triplet of a Coherently-Driven Single Quantum Dot