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

D. Ballarini; D. Sanvitto; A. Amo; L. Viña; M. Wouters; I. Carusotto; A. Lemaitre; J. Bloch

doi:10.1103/PhysRevLett.102.056402

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

D. Ballarini
, D. Sanvitto
, A. Amo
, L. Viña
, M. Wouters
, I. Carusotto
, A. Lemaitre
, J. Bloch

Departamento Física de Materiales
Universidad Autónoma de Madrid
Institute of Theoretical Physics
ENAC-IIC-GEL
Dipartimento di Fisica
Università di Trento
Centre de Nanosciences et de Nanotechnologies

Research output: Contribution to journal › Article › peer-review

33 Citations (Scopus)

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.

Original language	English
Article number	056402
Journal	Physical Review Letters
Volume	102
Issue number	5
DOIs	https://doi.org/10.1103/PhysRevLett.102.056402
Publication status	Published - 2 Feb 2009
Externally published	Yes

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10.1103/PhysRevLett.102.056402

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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.",

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AU - Ballarini, D.

AU - Sanvitto, D.

AU - Amo, A.

AU - Viña, L.

AU - Wouters, M.

AU - Carusotto, I.

AU - Lemaitre, A.

AU - Bloch, J.

PY - 2009/2/2

Y1 - 2009/2/2

N2 - 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.

AB - 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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ER -

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

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