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Dynamics of trapped polaritons in stressed gallium arsenide quantum well-microcavity structures: Experiments and numerical simulations.

机译：应力砷化镓量子阱微腔结构中俘获极化子的动力学：实验和数值模拟。

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摘要

Microcavity polaritons have been studied for a decade and a half. Soon after their discovery they were proposed as candidates for the observation of BEC in a solid. In consideration of this possibility, microcavity polaritons have been studied experimentally, analytically, and numerically. Most of the numerical studies have been qualitative. This thesis continues that analysis and for the first time fits experimentally obtained distributions with that obtained by numerical simulations.;For this thesis, experiments were performed on a GaAs quantum well-microcavity structure. Excitations of this structure are manifested as polaritons when the quantum well excitons are strongly coupled to the cavity mode. The experimental study of these polaritons provides interesting results. The experiments where the polariton density is the highest show that there is accumulation of polaritons in the low energy states near k = 0. Below this high density it is seen that the distribution becomes flat and maintains that shape as density is decreased. Neither the high density nor the low density data has a thermalized distribution. Can the accumulation at high density be explained with Boson statistics? What can explain the flat, nonthermalized distribution at low densities. To answer these questions a numerical model was developed. The model has shown that the distribuition functions from the experiments can be numerically simulated. The model has shown that the accumulation at k = 0 is due to Boson statistics. Through the model, an explanation as to why the distribution curves are flat is also provided.;This thesis is presented as follows. An introduction to microcavity polaritons and to our experimental system is presented in chapter 1. Chapter 2 describes the scattering processes that regulate the dynamics of the polaritons and the equations that are used in the model. Chapter 3 gives a review of previous numerical models on microcavity polaritons. Chapter 4 describes the experimental techniques used to acquire the data while chapter 5 compares the data with that given by the simulation. Chapter 6 then discusses directions for continued research.
机译：微腔极化子已经研究了十五年。他们发现后不久，便被提议作为固体中观察BEC的候选者。考虑到这种可能性，已经通过实验，分析和数值研究了微腔极化子。大多数数值研究都是定性的。本文继续进行分析，并首次将实验获得的分布与通过数值模拟获得的分布进行拟合。；为此，我们对GaAs量子阱微腔结构进行了实验。当量子阱激子与腔模强耦合时，这种结构的激发表现为极化子。这些极化子的实验研究提供了有趣的结果。极化子密度最高的实验表明，在k = 0附近的低能态中有极化子积累。在此高密度以下，可以看到分布变得平坦，并且随着密度的降低保持形状。高密度和低密度数据都没有热分布。可以用玻色子统计解释高密度的堆积吗？可以解释低密度下的平坦，非热分布。为了回答这些问题，开发了一个数值模型。该模型表明，可以对来自实验的分布函数进行数值模拟。该模型表明，k = 0时的累积归因于玻色子统计。通过该模型，还可以解释为什么分布曲线是平坦的。第1章介绍了微腔极化子和我们的实验系统。第2章介绍了调节极化子动力学的散射过程以及模型中使用的方程。第3章回顾了以前有关微腔极化子的数值模型。第4章介绍了用于获取数据的实验技术，而第5章则将数据与模拟给出的数据进行了比较。然后，第6章讨论了继续研究的方向。

著录项

  • 作者

    Hartwell, Vincent Edward.;

  • 作者单位

    University of Pittsburgh.;

  • 授予单位 University of Pittsburgh.;
  • 学科 Physics General.;Physics Condensed Matter.
  • 学位 Ph.D.
  • 年度 2008
  • 页码 176 p.
  • 总页数 176
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 物理学;
  • 关键词

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