Ultrafast Depopulation of a Quantum Dot by LA-phonon-assisted Stimulated Emission

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...

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Bibliographic Details
Published in:arXiv.org 2016-04
Main Authors: Liu, F, Martins, L M P, Brash, A J, Barth, A M, Quilter, J H, Axt, V M, Skolnick, M S, Fox, A M
Format: Article
Language:English
Subjects:
Emission
Lasers
Phonons
Population decline
Pulse duration
Quantum dots
Stimulated emission
Online Access:Get full text
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Summary: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.
ISSN:2331-8422
DOI:10.48550/arxiv.1602.00628