2006/08/31 by F. M. Marchetti, Jonathan Keeling, J. Keeling +3 · 3 citations
Engineering · Physics and Astronomy · #Absorption (acoustics) #Atomic physics #Condensed matter physics #Exciton-polaritons #Laser #Molecular physics #Optical microcavity #Optics #Photoluminescence #Physics #Plasmonic and Surface Plasmon Research #Polariton #Quantum mechanics #Rayleigh scattering #Scattering #Strong Light-Matter Interactions #Thermal Radiation and Cooling Technologies #cond-mat.mes-hall
paper · pdf · doi:10.1103/physrevb.76.115326
published as Phys. Rev. B 76, 115326 (2007) · 16 pages, 11 figures; minor corrections
openalex publication_date 2007/09/20 · arxiv created 2007/09/26 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
We investigate and compare different optical probes of a condensed state of microcavity polaritons in expected experimental conditions of nonresonant pumping. We show that the energy- and momentum-resolved resonant Rayleigh signal provides a distinctive probe of condensation as compared to, e.g., photoluminescence emission. In particular, the presence of a collective sound mode both above and below the chemical potential can be observed, as well as features directly related to the density of states of particle-hole-like excitations. Both resonant Rayleigh response and the absorption and photoluminescence are affected by the presence of quantum well disorder, which introduces a distribution of oscillator strengths between quantum well excitons at a given energy and cavity photons at a given momentum. As we show, this distribution makes it important that in the condensed regime, scattering by disorder is taken into account to all orders. We show that, in the low-density linear limit, this approach correctly describes inhomogeneous broadening of polaritons. In addition, in this limit, we extract a linear blueshift of the lower polariton versus density, with a coefficient determined by temperature and by a characteristic disorder length.