2008/07/21 by D. Ballarini, Dario Ballarini, D. Sanvitto +10 · 37 citations
Engineering · Physics and Astronomy · #Atomic physics #Excitation #Laser #Optical parametric oscillator #Optics #Optoelectronics #Parametric oscillator #Parametric statistics #Physics #Polariton #Quantum and electron transport phenomena #Quantum mechanics #Semiconductor #Strong Light-Matter Interactions #Thermal Radiation and Cooling Technologies #cond-mat.other
paper · pdf · doi:10.1103/physrevlett.102.056402
published in Physical Review Letters 102(5), 056402 (American Physical Society)
arxiv created 2008/07/21 · openalex publication_date 2009/02/02 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
The excitation spectrum around the pump-only stationary state of a polariton optical parametric oscillator in semiconductor microcavities is investigated by time-resolved photoluminescence. The response to a weak pulsed perturbation in the vicinity of the idler mode is directly related to the lifetime of the elementary excitations. A dramatic increase of the lifetime is observed for a pump intensity approaching and exceeding the optical parametric oscillator threshold. The observations can be explained in terms of a critical slowing down of the dynamics upon approaching the threshold and the following appearance of a soft Goldstone mode in the spectrum.