Observation of long-lived polariton states in semiconductor microcavities across the parametric threshold

Year: 2009

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.102.056402

Citations: 28
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