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arXiv 0807.3224cond-mat.other
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半导体微腔中长寿命极化激元跨参量阈值的观测

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

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

摘要:

利用时间分辨光致发光技术研究了半导体微腔中极化激元光参量振荡器(OPO)的纯泵浦定态附近的激发光谱。对闲频模附近的弱脉冲扰动的响应与基元激发的寿命直接相关。当泵浦光强度接近或超过OPO阈值时,观察到寿命的显著增加。观测结果可以解释为在接近阈值时动力学的临界减慢和随后的软戈德斯通模式的发生。

英文摘要:

The excitation spectrum around the pump-only stationary state of a polariton optical parametric oscillator (OPO) 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 OPO threshold. The observations can be explained in terms of a critical slowing down of the dynamics upon approaching the threshold and the following onset of the soft Goldstone mode.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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