Observation of long-lived polariton states in semiconductor microcavities across the parametric threshold
Authors: Ballarini D., Sanvitto D., Amo A., Vina L., Wouters M., Carusotto I., Lemaitre A., Bloch J.
Autors Affiliation: Departamento Fısica de Materiales, Universidad Autonoma de Madrid, 28049 Madrid, Spain; Institute of Theoretical Physics, Ecole Polytechnique Federale de Lausanne EPFL, CH-1015 Lausanne, Switzerland; BEC-CNR-INFM and Dipartimento di Fisica, Universita` di Trento, I-38050 Povo, Italy; LPN/CNRS, Route de Nozay, 91460, Marcoussis, France
Abstract: 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.
Journal/Review: PHYSICAL REVIEW LETTERS
Volume: 102 (5) Pages from: 056402 to: 056402
More Information: This work was partially supported by the Spanish Ministerio de Educacion y Ciencia (MAT2005-01388, NAN2004-09109-C04-04, and QOIT-CSD2006-00019), the Comunidad Autonoma de Madrid (S-0505/ESP0200), and IMDEA-Nanociencia. D. S. thanks the Ramon y Cajal Programme. I. C. is indebted to C. Ciuti for continuous discussions and acknowledges support from the Italian MIUR, the French CNRS and IFRAF, and the EuroQUAM-FerMix program.DOI: 10.1103/PhysRevLett.102.056402Citations: 28data from “WEB OF SCIENCE” (of Thomson Reuters) are update at: 2022-12-04References taken from IsiWeb of Knowledge: (subscribers only)Connecting to view paper tab on IsiWeb: Click hereConnecting to view citations from IsiWeb: Click here