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Dynamic vibronic coupling in InGaAs quantum dots [Invited]

Title data

Brash, A. J. ; Martins, L. M. P. ; Barth, Andreas M. ; Liu, Feng ; Quilter, John H. ; Glässl, Martin ; Axt, Vollrath Martin ; Ramsay, A. J. ; Skolnick, M. S. ; Fox, A. M.:
Dynamic vibronic coupling in InGaAs quantum dots [Invited].
In: Journal of the Optical Society of America B. Vol. 33 (2016) Issue 7 . - S. C115-C122.
ISSN 1520-8540
DOI: https://doi.org/10.1364/JOSAB.33.00C115

Project information

Project financing: Deutsche Forschungsgemeinschaft
Engineering and Physical Sciences Research Council (EPSRC) (EP/J007544/1)

Abstract in another language

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 blueshifted 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 blueshifted and redshifted pulses can create and destroy an exciton within a timescale of ∼20 ps as determined by the pulse duration and ultimately limited by the phonon thermalization time.

Further data

Item Type: Article in a journal
Refereed: Yes
Keywords: quantum dot; path-integrals; nonlinear optics; ultrafast dynamics; pure dephasing; phonons; decoherence; exciton inversion; non-Markovian dynamics; memory effects; phonon-induced memory; multi-phonon processes; exciton preparation; phonon-assisted off-resonant preparation; numerically complete real-time path integrals; quantum dissipative dynamics; exciton control; Spectroscopy; semiconductors; Ultrafast processes in condensed matter; including semiconductors
Institutions of the University: Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics
Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics > Chair Theoretical Physics III > Chair Theoretical Physics III - Univ.-Prof. Dr. Martin Axt
Faculties
Faculties > Faculty of Mathematics, Physics und Computer Science
Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics > Chair Theoretical Physics III
Result of work at the UBT: Yes
DDC Subjects: 500 Science > 530 Physics
Date Deposited: 03 Nov 2017 10:57
Last Modified: 29 Oct 2019 07:29
URI: https://eref.uni-bayreuth.de/id/eprint/40285