Observation of Long-Lived Polariton States in Semiconductor Microcavities across the Parametric Threshold

被引：27

作者：

Ballarini, D. ^{[1
]}

Sanvitto, D. ^{[1
]}

Amo, A. ^{[1
]}

Vina, L. ^{[1
]}

Wouters, M. ^{[2
]}

Carusotto, I. ^{[3
,4
]}

Lemaitre, A. ^{[5
]}

Bloch, J. ^{[5
]}

机构：

[1] Univ Autonoma Madrid, Dept Fis Mat, E-28049 Madrid, Spain

[2] Ecole Polytech Fed Lausanne, Inst Theoret Phys, CH-1015 Lausanne, Switzerland

[3] Univ Trent, Dipartimento Fis, I-38050 Trento, Italy

[4] Univ Trent, INFM, CNR, BEC, I-38050 Trento, Italy

[5] CNRS, LPN, F-91460 Marcoussis, France

来源：

PHYSICAL REVIEW LETTERS | 2009年 / 102卷 / 05期

关键词：

BOSE-EINSTEIN CONDENSATION; STIMULATED SCATTERING; EQUILIBRIUM; DYNAMICS;

D O I：

10.1103/PhysRevLett.102.056402

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

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.

引用

页数：4

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