2008/02/29 by Leonidas Mouchliadis, L. Mouchliadis, A. L. Ivanov
Engineering · Physics and Astronomy · #Plasmonic and Surface Plasmon Research #Quantum and electron transport phenomena #Strong Light-Matter Interactions #cond-mat.mes-hall
paper · pdf · doi:10.1103/physrevb.78.033306
arxiv created 2008/03/04 · openalex publication_date 2008/07/22 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
We propose and analyze a k_\ensuremath∥-filtering effect which gives rise to the drastic difference between the actual spatial coherence length of quasi-two-dimensional excitons or microcavity polaritons in planar nanostructures and that inferred from far-field optical measurements. The effect originates from conservation of the in-plane wave-vector k_\ensuremath∥ in the optical decay of the particles in outgoing bulk photons. The k_\ensuremath∥-filtering effect explains the large coherence lengths recently observed for indirect excitons in coupled quantum wells but is less pronounced for microcavity polaritons at low temperatures, T\ensuremath\lesssim10 K.