Journal
PHYSICAL REVIEW LETTERS
Volume 102, Issue 5, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.102.056402
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Funding
- Spanish Ministerio de Educacion y Ciencia [MAT2005-01388, NAN2004-09109-C04-04, QOIT-CSD2006-00019]
- Comunidad Autonoma de Madrid [S-0505/ESP0200]
- IMDEA-Nanociencia
- Italian MIUR
- French CNRS
- IFRAF
- EuroQUAM-FerMix program
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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.
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