2010/04/23 by Esther Wertz, Lydie Ferrier, D. D. Solnyshkov +18 · 3 citations
Engineering · Physics and Astronomy · #Coherence (philosophical gambling strategy) #Condensed matter physics #Excitation #Exciton #Exciton-polaritons #Matter wave #Physics #Polariton #Quantum #Quantum and electron transport phenomena #Quantum mechanics #Strong Light-Matter Interactions #Thermal Radiation and Cooling Technologies #Wave function #cond-mat.other
paper · pdf · doi:10.1038/nphys1750
Main article + supplementary information 19 pages and 7 figures
arxiv created 2010/04/23 · openalex publication_date 2010/08/29 · arxiv updated 2015/05/18 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
Cavity exciton-polaritons (polaritons) are bosonic quasi-particles offering a unique solid-state system to investigate interacting condensates. Up to now, disorder induced localization and short lifetimes have prevented the establishment of long range off diagonal order needed for any quantum manipulation of the condensate wavefunction. In this work, using a wire microcavity with polariton lifetimes ten times longer than in all previously existing samples, we show that polariton condensates can propagate over macroscopic distances outside the excitation area, while preserving their spontaneous spatial coherence. An extended condensate wave-function builds-up with a degree of spatial coherence larger than 50% over distances 50 times the polariton De Broglie wavelength. The expansion of the condensate is shown to be governed by the repulsive potential induced by photo-generated excitons within the excitation area. The control of this local potential offers a new and versatile method to manipulate extended polariton condensates. As an illustration, we demonstrate synchronization of extended condensates via controlled tunnel coupling and localization of condensates in a trap with optically controlled dimensions.