Coherent interactions between phonons and exciton or exciton-polariton condensates
D.V. Vishnevsky, N.A. Gippius, I.A. Shelykh, D.D. Solnyshkov, G., Malpuech
TL;DR
This paper investigates the interaction between exciton or exciton-polariton condensates and coherent acoustic waves in semiconductor microcavities, revealing modified dispersion relations and the emergence of roton instability regions.
Contribution
It provides an analytical solution for the dispersion of coupled condensate-phonon systems and explores the effects of momentum-dependent interactions.
Findings
Analytical dispersion relation derived for the coupled system.
Identification of roton instability region due to k-dependent interactions.
Stronger dispersion modifications when accounting for momentum dependence.
Abstract
We analyse the interaction of exciton and exciton-polariton condensates in semiconductor microcavity with a coherent acoustic wave. An analytical solution for the dispersion of excitations of coupled condensate-phonon system is found in the approximation of k-independent interactions. Accounting for k-dependence results in a stronger modification of the dispersion, and even in the appearance of the "roton instability" region.
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