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首页> 外文期刊>Physical review >Polarization-correlated three-photon emission from charged triexcitons in a single quantum dot
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Polarization-correlated three-photon emission from charged triexcitons in a single quantum dot

机译：单个量子点中带电三激子与极化相关的三光子发射

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摘要

We demonstrate polarization-correlated three-photons emitted from a positively charged triexciton in a self-assembled GaAs quantum dot (QD). The charged triexciton consists of three electrons and four holes. Several intermediate states appear in the cascade recombination because of the exchange interaction. Spin singlet and triplet states of charged biexcitons and charged excitons are respectively identified in the photoluminescence spectra. We found that the degree of polarization correlation of the three-photons is different according to which intermediate states are used. A pathway through an excited state of a charged biexciton shows a high degree of polarization correlation, because the polarizations of these photons are dominantly determined by electron spins, which have longer lifetime than the holes. The spin relaxation times were estimated for an electron and a hole by a rate equation analysis with cross-correlation measurements.
机译：我们展示了在自组装GaAs量子点（QD）中从带正电的激子发射的偏振相关的三光子。带电三激子由三个电子和四个空穴组成。由于交换相互作用，在级联重组中出现几个中间状态。带电双激子和带电激子的自旋单重态和三重态在光致发光光谱中分别确定。我们发现，根据所使用的中间状态，三光子的极化相关程度不同。通过带电双激子激发态的路径显示出高度的极化相关性，因为这些光子的极化主要由电子自旋确定，电子自旋的寿命比空穴长。通过具有互相关测量的速率方程分析，可以估计电子和空穴的自旋弛豫时间。

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  • 来源
    《Physical review》 |2012年第23期|p.235318.1-235318.5|共5页
  • 作者

    Y. Arashida; Y. Ogawa; F. Minami;

  • 作者单位

    Department of Physics, Tokyo Institute of Technology, Oh-Okayama 2-12-1, Tokyo 152-8551, Japan;

    Department of Physics, Tokyo Institute of Technology, Oh-Okayama 2-12-1, Tokyo 152-8551, Japan;

    Department of Physics, Tokyo Institute of Technology, Oh-Okayama 2-12-1, Tokyo 152-8551, Japan;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    quantum dots; quantum dots; Ⅲ-Ⅴ semiconductors;

    机译：量子点;量子点;Ⅲ-Ⅴ族半导体;

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