Brash, A.J., Martins, L.M.P.P., Barth, A.M. et al. (7 more authors) (2016) Dynamic vibronic coupling in InGaAs quantum dots. Journal of the Optical Society of America B, 33 (7). C115-C112. ISSN 1520-8540
Abstract
The electron-phonon coupling in self-assembled InGaAs quantum dots is relatively weak at low light intensities, which means that the zero-phonon line in emission is strong compared to the phonon sideband. However, the coupling to acoustic phonons can be dynamically enhanced in the presence of an intense optical pulse tuned within the phonon sideband. Recent experiments have shown that this dynamic vibronic coupling can enable population inversion to be achieved when pumping with a blue-shifted laser and for rapid de-excitation of an inverted state with red detuning. In this paper we confirm the incoherent nature of the phonon-assisted pumping process and explore the temperature dependence of the mechanism. We also show that a combination of blue- and red-shifted pulses can create and destroy an exciton within a timescale ∼ 20 ps determined by the pulse duration and ultimately limited by the phonon thermalisation time.
Metadata
Item Type: | Article |
---|---|
Authors/Creators: |
|
Copyright, Publisher and Additional Information: | © 2016 Optical Society of America. This is an author produced version of a paper subsequently published in Journal of the Optical Society of America B. Uploaded in accordance with the publisher's self-archiving policy. |
Dates: |
|
Institution: | The University of Sheffield |
Academic Units: | The University of Sheffield > Faculty of Science (Sheffield) > Department of Physics and Astronomy (Sheffield) |
Funding Information: | Funder Grant number ENGINEERING AND PHYSICAL SCIENCE RESEARCH COUNCIL (EPSRC) EP/J007544/1 |
Depositing User: | Symplectic Sheffield |
Date Deposited: | 18 May 2016 10:58 |
Last Modified: | 25 Oct 2016 22:42 |
Published Version: | http://dx.doi.org/10.1364/JOSAB.33.00C115 |
Status: | Published |
Publisher: | Optical Society of America |
Refereed: | Yes |
Identification Number: | 10.1364/JOSAB.33.00C115 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:99845 |