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Quantum kinetics of squeezed lattice displacement generated by phonon down conversion

机译:声子降频转换产生的压缩晶格位移的量子动力学

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摘要

We study the fluctuation properties of longitudinal acoustic (LA) phonons generated by the anharmonic decay of coherent longitudinal optical phonons in a bulk semiconductor and a quantum dot. This process is comparable to the down conversion of photons, which is well known to generate squeezed photons. We use a quantum kinetic model to calculate the fluctuations of lattice displacement and momentum. This allows us to analyze the strength and the spatial distribution of the fluctuations. It is shown that the fluctuations may fall below their vacuum value, i.e., squeezing occurs. The squeezing only persists for short times due to fast dephasing of the different LA phonon modes and the increasing LA phonon population. In the quantum dot case, it is found that although LA phonon wave packets travel out of the quantum dot, the squeezing does not leave the vicinity of the dot but remains confined.
机译:我们研究了由体半导体和量子点中相干纵向光学声子的非谐衰变产生的纵向声学(LA)声子的涨落特性。此过程与光子的下转换相当,众所周知,光子的下转换会产生压缩的光子。我们使用量子动力学模型来计算晶格位移和动量的波动。这使我们能够分析波动的强度和空间分布。结果表明,波动可能降至其真空值以下,即发生挤压。由于不同LA声子模式的快速移相和LA声子数量的增加,挤压仅持续了很短的时间。在量子点的情况下,发现尽管LA声子波包从量子点中移出,但压缩并没有离开该点的附近,而是受到限制。

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  • 来源
    《Physical review》 |2011年第16期|p.165310.1-165310.8|共8页
  • 作者单位

    Institut fuer Festkoerpertheorie, Universitaet Muenster, Wilhelm-Klemm-Strasse 10, D-48149 Muenster, Germany;

    Institut fuer Festkoerpertheorie, Universitaet Muenster, Wilhelm-Klemm-Strasse 10, D-48149 Muenster, Germany;

    Institut fuer Festkoerpertheorie, Universitaet Muenster, Wilhelm-Klemm-Strasse 10, D-48149 Muenster, Germany;

    Institut fuer Festkoerpertheorie, Universitaet Muenster, Wilhelm-Klemm-Strasse 10, D-48149 Muenster, Germany;

    Theoretische Physik III, Universitdt Bayreuth, D-95440 Bayreuth, Germany;

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  • 正文语种 eng
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  • 关键词

    other topics in lattice dynamics (restricted to new topics in section 63);

    机译:晶格动力学中的其他主题(仅限于第63节中的新主题);

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