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Proceedings Paper

Multidimensional coherent spectroscopy of a semiconductor microcavity
Author(s): Brian L. Wilmer; Felix Passmann; Michael Gehl; Galina Khitrova; Alan D. Bristow
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Paper Abstract

Multidimensional coherent spectroscopy maps the detuning dependence of the upper (UP) and lower (LP) excitonpolariton branches1 in a wedged microcavity with a single InGaAs quantum well at 5 K. Features on the diagonal correspond to intra-action coherences of the UP and LP branches. Off-diagonal peaks are interaction coherences between the UP and LP branches. With increasing detuning (Δ), all peaks move to higher energy, the exciton-like (EEX) and cavity-like (Eγ) modes swap position and have maximum intensity near the anti-crossing at Δ=0. An isolated biexciton (B) is only seen at Δ<0, separated by a binding energy of approximately 2 meV. For Δ>0, the spectral weight of the off-diagonal features swap, as the LP and B come into resonance. This indicates that the off-diagonal features are sensitive to the interactions including two-quantum contributions and that a situation similar to a Feshbach resonance exists.2 Polarization of two-quantum contributions show spin sensitive two-polariton and new biexciton correlations. The latter likely influence the Feshbach resonance between biexcitons and two-polariton states. The two-quantum signatures also demonstate that biexcitons perturb the light-matter coupling in the microcavity to reduce the mixed two-polariton contributions. Detuning dependence of zero-quantum contributions show Raman-like coherences that are enhanced near zero detuning. Asymmetry of the Raman coherences are indicative of many-body interactions, which also grow stronger as the light-matter interactions are enhanced near zero deuning.

Paper Details

Date Published: 14 March 2016
PDF: 7 pages
Proc. SPIE 9746, Ultrafast Phenomena and Nanophotonics XX, 97461B (14 March 2016); doi: 10.1117/12.2212045
Show Author Affiliations
Brian L. Wilmer, West Virginia Univ. (United States)
Felix Passmann, West Virginia Univ. (United States)
Technische Univ. Dortmund (Germany)
Michael Gehl, College of Optical Sciences, The Univ. of Arizona (United States)
Galina Khitrova, College of Optical Sciences, The Univ. of Arizona (United States)
Alan D. Bristow, West Virginia Univ. (United States)

Published in SPIE Proceedings Vol. 9746:
Ultrafast Phenomena and Nanophotonics XX
Markus Betz; Abdulhakem Y. Elezzabi, Editor(s)

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