Abstract

We have observed Rabi oscillations in an InAs quantum dot ensemble by using optical pre-pulse 2D coherent spectroscopy. The polarization for 2D coherent spectroscopy is set to be cross-linear in order to obtain biexciton signal, which enables us to distinguish the signals from the ground and excited states. Furthermore, the spectral domain in 2D can reveal the coherent evolution in an inhomogeneously broadened ensemble. With increasing pre-pulse intensity, the signals attributed to the ground and excited states exhibit the sinusoidal decrease and increase, respectively. The observed excitation behavior is well reproduced by a damped oscillation model. From the fitting the pulse area achieved in this work is deduced to be 0.41\( \pi \) and the dipole moment is estimated as 29 Debye.

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