We demonstrate ultrafast incoherent depopulation of a quantum dot from above to below the transparency point using LA-phonon-assisted emission stimulated by a redshifted laser pulse. The QD is turned from a weakly vibronic system into a strongly vibronic one by laser driving which enables the phonon-assisted relaxation between the excitonic components of two dressed states. The depopulation is achieved within a laser pulse-width-limited time of 20 ps and exhibits a broad tuning range of a few meV. Our experimental results are well reproduced by path-integral calculations.
@article{arxiv.1602.00628,
title = {Ultrafast Depopulation of a Quantum Dot by LA-phonon-assisted Stimulated Emission},
author = {F. Liu and L. M. P. Martins and A. J. Brash and A. M. Barth and J. H. Quilter and V. M. Axt and M. S. Skolnick and A. M. Fox},
journal= {arXiv preprint arXiv:1602.00628},
year = {2016}
}
Comments
5 pages, 4 figures, presented in FOPS2015, EQEP2015, and MSS-17