Borri Paola, Langbein Wolfgang
School of Biosciences, Cardiff University, Cardiff CF10 3TL, UK.
J Phys Condens Matter. 2007 Jul 25;19(29):295201. doi: 10.1088/0953-8984/19/29/295201. Epub 2007 Jun 11.
In this paper we summarize our experimental work on the dephasing of excitons in self-assembled InAs/GaAs quantum dots, measured using a sensitive four-wave mixing technique in heterodyne detection. Transient four-wave mixing is a powerful technique to measure not only exciton dephasing times but also fine-structure splitting energies and exciton-biexciton binding energies which are important physical parameters for the implementation of quantum dots as source of polarization-entangled photon pairs and in the design of quantum algorithms. The scope of this paper is to review and discuss, in the context of present theories and in comparison with other experiments in the literature, the most significant results of our study on a series of thermally annealed quantum dots exhibiting systematic differences in the excitonic recombination energies and quantum confinement potentials. We will highlight the main outcomes of these measurements and give a perspective in terms of open questions that still need to be investigated, possible new experiments and potential areas of interest.
在本文中，我们总结了关于自组装InAs/GaAs量子点中激子退相的实验工作，该工作采用外差检测中的灵敏四波混频技术进行测量。瞬态四波混频是一种强大的技术，不仅可以测量激子退相时间，还能测量精细结构分裂能和激子 - 双激子结合能，这些都是将量子点用作偏振纠缠光子对源以及量子算法设计中的重要物理参数。本文的范围是在当前理论背景下，与文献中的其他实验进行比较，回顾和讨论我们对一系列热退火量子点的研究中最显著的结果，这些量子点在激子复合能量和量子限制势方面呈现出系统差异。我们将突出这些测量的主要结果，并就仍需研究的开放性问题、可能的新实验以及潜在的感兴趣领域给出展望。
