• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文学位 >Theory of excitonic optical properties of semiconductor quantum wells and Bragg structures.
【24h】

Theory of excitonic optical properties of semiconductor quantum wells and Bragg structures.

机译：半导体量子阱和布拉格结构的激子光学性质理论。

获取原文
获取原文并翻译 | 示例
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

This dissertation addresses both fundamental aspects of the coherent exciton kinetics in single semiconductor quantum wells and more application-oriented aspects of the collective excitonic optical properties in quantum well Bragg structures.; We use a bosonic theory to investigate the ultrafast coherent exciton dynamics after an optical excitation in a single semiconductor quantum well. It is shown that, on intermediate time scales, nonlinear mean-field interactions between excitons lead to a coherent, wave-like evolution in the momentum distribution of optically inactive excitons, which can survive for some time before dephasing sets in. Driven by two-exciton correlations, this coherent quantum kinetic effect bridges the well-known kinetics associated with optical excitation on the one hand and incoherent relaxation on the other.; We also study more general dynamical properties of bosonic mean field systems with N-species of excitons (in a single semiconductor quantum well). We find that the momentum-conserving exciton mean field equations, including the coupling to external fields and fermionic corrections, have the dynamical structure su(N,N). We show that one can define a non-real generalized "Bloch vector" and a non-hermitian "density matrix" description, which allow us to explicitly obtain all the constants of motion associated with the su(N,N) symmetry.; The many-body effects and correlations of excitons in a single quantum well are mainly induced by the Coulomb interactions. In the case of a semiconductor quantum well Bragg structure, the light induced coupling between different quantum wells also dramatically affects the excitons' behavior, especially through the collective excitations of excitons in the whole structure.; We investigate the linear excitonic optical properties of the quantum well Bragg structure induced by the collective excitations using the transfer matrix approach. We show that the so called "intermediate band" (IB) created by the exciton resonance, which does not exist in conventional photonic crystals, can be used for the stopping, storing and releasing of light, which is important in information processing devices. We also discuss the compensation of the dispersive distortion in the light delay process through reversing the IB band structure. Other conceptual and practical issues such as the decay rate of the IB modes and the generalized anti-reflection coating are also investigated.
机译：本文讨论了单个半导体量子阱中相干激子动力学的基本方面以及量子阱布拉格结构中的集体激子光学性质的更多面向应用的方面。我们使用玻色子理论来研究单个半导体量子阱中的光激发后的超快相干激子动力学。结果表明，在中间时间尺度上，激子之间的非线性平均场相互作用会导致光学惰性激子的动量分布发生连贯的，呈波状的演化，该相变可以存活一段时间，然后移入相态。激子相关，这种相干的量子动力学效应一方面桥接了与光激发相关的众所周知的动力学，另一方面又与非相干弛豫相关联。我们还研究了N种激子（在单个半导体量子阱中）的Bosonic平均场系统的一般动力学特性。我们发现，动量守恒激子平均场方程，包括与外部场的耦合和费米离子校正，具有动力学结构su（N，N）。我们表明，可以定义一个非实数的广义“ Bloch向量”和一个非埃尔米特式的“密度矩阵”描述，这使我们能够明确获得与su（N，N）对称性相关的所有运动常数。单量子阱中激子的多体效应和相关性主要是由库仑相互作用引起的。在半导体量子阱布拉格结构的情况下，不同量子阱之间的光感应耦合也会显着影响激子的行为，特别是通过整个结构中激子的集体激发。我们使用转移矩阵方法研究了由集体激发引起的量子阱布拉格结构的线性激子光学性质。我们表明，由激子共振产生的所谓“中间带”（IB）在常规光子晶体中不存在，可以用于光的停止，存储和释放，这在信息处理设备中很重要。我们还讨论了通过反转IB波段结构来补偿光延迟过程中的色散失真。还研究了其他概念和实际问题，例如IB模式的衰减率和广义抗反射涂层。

著录项

  • 作者

    Yang, Zhenshan.;

  • 作者单位

    The University of Arizona.;

  • 授予单位 The University of Arizona.;
  • 学科 Physics Optics.
  • 学位 Ph.D.
  • 年度 2005
  • 页码 118 p.
  • 总页数 118
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 光学;
  • 关键词

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号