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Keldysh field theory for nonequilibrium condensation in a parametrically pumped polariton system

机译:参数泵浦极化子系统中非平衡冷凝的Keldysh场理论

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We develop a quantum field theory for parametrically pumped polaritons using Keldysh Green's function techniques with which the occupations of the excitation spectra can be calculated. By considering the mean field and Gaussian fluctuations, we find that the highly nonequilibrium phase transition to the optical parametric oscillator regime is in some ways similar to equilibrium condensation. In particular, we show that this phase transition can be associated with an effective chemical potential, at which the system's bosonic distribution function diverges, and an effective temperature for low energy modes. As in equilibrium systems, the transition is achieved by tuning this effective chemical potential to the energy of the lowest normal mode. Since the nonequilibrium occupations of the modes are available, we determine experimentally observable properties such as the luminescence and absorption spectra.
机译:我们使用Keldysh Green函数技术开发了用于参数泵浦极化子的量子场论,利用该技术可以计算激发光谱的职业。通过考虑平均场和高斯波动,我们发现到光学参量振荡器状态的高度非平衡相变在某些方面类似于平衡凝聚。尤其是,我们证明了这种相变可能与有效的化学势(系统的玻色子分布函数在该处发散)以及有效的低能模式温度相关。像在平衡系统中一样,通过将有效化学势调整为最低标准模式的能量来实现过渡。由于模式的非平衡职业是可用的,因此我们确定了实验上可观察到的性质,例如发光和吸收光谱。

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  • 来源
    《Physical review》 |2016年第19期|195306.1-195306.15|共15页
  • 作者

    K. Dunnett; M. H. Szymanska;

  • 作者单位

    Department of Physics and Astronomy, University College London, Gower Street, London, WC1E 6BT, United Kingdom;

    Department of Physics and Astronomy, University College London, Gower Street, London, WC1E 6BT, United Kingdom;

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