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Long-range transport in excitonic dark states in coupled quantum wells

机译：耦合量子阱中激子暗态的长距离传输

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摘要

During the past ten years, coupled quantum wells have emerged as a promising system for experiments on Bose condensation of excitons, with numerous theoretical and experimental studies aimed at the demonstration of this effect. One of the issues driving these studies is the possibility of long-range coherent transport of excitons. Excitons in quantum wells typically diffuse only a few micrometres from the spot where they are generated by a laser pulse; their diffusion is limited by their lifetime (typically a few nanoseconds) and by scattering due to disorder in the well structure. Here we report photoluminescence measurements of InGaAs quantum wells and the observation of an effect by which luminescence from excitons appears hundreds of micrometres away from the laser excitation spot. This luminescence appears as a ring around the laser spot; almost none appears in the region between the laser spot and the ring. This implies that the excitons must travel in a dark state until they reach some critical distance, at which they collectively revert to luminescing states. It is unclear whether this effect is related to macroscopic coherence caused by Bose condensation of excitons.
机译：在过去的十年中，耦合量子阱已成为一种有希望的激子玻色凝聚实验的系统，大量的理论和实验研究都旨在证明这种效应。驱动这些研究的问题之一是激子的长距离相干运输的可能性。量子阱中的激子通常仅从激光脉冲产生激子的位置扩散几微米。它们的扩散受其寿命（通常为几纳秒）和井结构无序散射的限制。在这里，我们报告了InGaAs量子阱的光致发光测量结果，以及从激子发出的光似乎与激光激发点相距数百微米的影响的观察结果。这种发光看起来像是激光点周围的环。在激光点和环之间的区域几乎没有出现。这意味着激子必须在黑暗状态下传播，直到它们达到某个临界距离为止，在该临界距离处，激子集体恢复为发光状态。尚不清楚这种作用是否与激子的玻色凝聚引起的宏观相干有关。

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  • 来源
    《Nature》 |2002年第6899期|p.754-757|共4页
  • 作者

    D. Snoke; S. Denev; Y. Liu; L. Pfeiffer; K. West;

  • 作者单位

    Department of Physics and Astronomy, University of Pittsburgh, 3941 O'Hara Street, Pennsylvania 15260, USA;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 自然科学总论;
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