Title
Observation of long-lived polariton states in semiconductor microcavities across the parametric threshold Observation of long-lived polariton states in semiconductor microcavities across the parametric threshold
Author
Faculty/Department
Faculty of Sciences. Physics
Publication type
article
Publication
New York, N.Y. ,
Subject
Physics
Source (journal)
Physical review letters. - New York, N.Y.
Volume/pages
102(2009) :5 , 4 p.
ISSN
0031-9007
Article Reference
056402
Carrier
E-only publicatie
Target language
English (eng)
Full text (Publishers DOI)
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.
Full text (open access)
https://repository.uantwerpen.be/docman/irua/6a1369/74d97a76.pdf