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arXiv 1708.09199cond-mat.quant-gas
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驱动耗散量子系统的动力学临界指数

Dynamical critical exponents in driven-dissipative quantum systems

P. Comaron, G. Dagvadorj, A. Zamora, I. Carusotto, N. P. Proukakis, M. H. Szymańska

摘要:

我们研究了参数非相干驱动的微腔极化激元在临界区无限快速猝灭后的相序。我们确认,该系统,尽管其驱动耗散的性质,满足动力学标度假设的两个驱动方案表现出自相似的模式,两点相关器在后期的相位排序。我们表明,极化激元的特点是由动力学临界指数z ~ 2与拓扑缺陷发挥了根本性的作用,动力学,对数修正的幂律衰减的涡的数量和相关的增长的特征长度尺度。

英文摘要:

We study the phase-ordering of parametrically and incoherently driven microcavity polaritons after an infinitely rapid quench across the critical region. We confirm that the system, despite its driven-dissipative nature, fulfils dynamical scaling hypothesis for both driving schemes by exhibiting self-similar patterns for the two-point correlator at late times of the phase ordering. We show that polaritons are characterised by the dynamical critical exponent z ~ 2 with topological defects playing a fundamental role in the dynamics, giving logarithmic corrections both to the power-law decay of the number of vortices and to the associated growth of the characteristic length-scale.

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