Ultrafast depopulation of a quantum dot by LA-phonon-assisted stimulated emission

Titelangaben

Liu, Feng ; Martins, L. M. P. ; Brash, A. J. ; Barth, Andreas M. ; Quilter, John H. ; Axt, Vollrath Martin ; Skolnick, Maurice S. ; Fox, A. M.:
Ultrafast depopulation of a quantum dot by LA-phonon-assisted stimulated emission.
In: Physical Review B. Bd. 93 (2016) Heft 16 . - 161407(R).
ISSN 0163-1829
DOI: https://doi.org/10.1103/PhysRevB.93.161407

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Abstract

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.