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Backscattering suppression in supersonic 1D polariton condensates.

D Tanese¹, D D Solnyshkov, A Amo

¹Laboratoire de Photonique et Nanostructures, LPN/CNRS, Route de Nozay, 91460 Marcoussis, France.

Physical Review Letters

|March 10, 2012

Summary

We found that increasing polariton condensate density suppresses backscattering from structural imperfections. This occurs in the supersonic regime, enabling condensate "hopping" and reducing polariton scattering at high speeds.

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Area of Science:

Condensed matter physics
Quantum optics
Semiconductor physics

Background:

Polariton condensates in semiconductor microcavities exhibit complex dynamics.
Disorder in structures can significantly affect wave propagation and scattering.
Understanding scattering mechanisms is crucial for controlling quantum systems.

Purpose of the Study:

To investigate the impact of structural disorder on the propagation of one-dimensional polariton condensates.
To explore the relationship between condensate density and backscattering suppression.
To identify novel mechanisms for scattering reduction in polaritonic systems.

Main Methods:

Experimental investigation of 1D polariton condensates in semiconductor microcavities.
Varying condensate density to observe changes in propagation dynamics.
Analysis of backscattering and parametric instabilities.

Main Results:

Observed strong suppression of backscattering with increasing condensate density.
Suppression of backscattering occurs in the supersonic regime.
Simultaneous onset of parametric instabilities facilitating condensate "hopping" through disorder.

Conclusions:

High polariton condensate density can overcome structural imperfections by suppressing backscattering.
Parametric instabilities provide a mechanism for condensate transport in disordered potentials.
A new scattering reduction mechanism for high-speed polaritons has been identified.