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

F. Liu, L. M P Martins, A. J. Brash, A. M. Barth, J. H. Quilter, V. M. Axt, M. S. Skolnick, A. M. Fox

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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.
Original languageEnglish
Article number161407(R)
Pages (from-to)1-5
Number of pages5
JournalPhysical Review B
Volume93
Issue number16
DOIs
Publication statusPublished - 18 Apr 2016

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