...
首页> 外文期刊>Physical review >Volume dependence of excitonic fine structure splitting in geometrically similar quantum dots
【24h】

Volume dependence of excitonic fine structure splitting in geometrically similar quantum dots

机译:几何相似量子点中激子精细结构分裂的体积依赖性

获取原文
获取原文并翻译 | 示例
           

摘要

We investigate the fine structure splitting (FSS) of excitons confined in strain-free, highly symmetric GaAs/AlGaAs quantum dots (QDs) as a function of size. QDs with similar geometry are created by filling nanoholes on an AlGaAs surface with different amounts of GaAs. In turn, nanoholes of regular reversed-cone shape are obtained by Al-droplet etching of an AlGaAs layer. The resulting QDs have high optical quality, as witnessed by emission linewidths smaller than 20 μeV under nonresonant excitation. The average FSS decreases from 12.5 ± 6.4 to 3.6 ± 1.7 μeV as the QD height increases from 5.4 ± 0.3 to 8.0 ± 0.2 nm, following the expected 1/volume dependence. Theoretical calculations using atomic force microscopy data of QD structures as input show that the geometrical similarity of QDs is reflected in invariant aspect ratio and lateral elongation of the wave functions and reproduce the experimental FSS energies.
机译:我们研究了限制在无应变,高度对称的GaAs / AlGaAs量子点(QDs)中的激子的精细结构分裂(FSS)与尺寸的关系。通过用不同量的GaAs填充AlGaAs表面上的纳米孔来创建具有相似几何形状的QD。进而,通过AlGaAs层的Al液滴蚀刻获得规则倒圆锥形状的纳米孔。最终的量子点具有高光学质量,在非谐振激发下,发射线宽小于20μeV即可证明。随着QD高度从5.4±0.3 nm增加到8.0±0.2 nm,遵循预期的1 /体积依赖性,平均FSS从12.5±6.4降低到3.6±1.7μeV。使用QD结构的原子力显微镜数据作为输入的理论计算表明,QD的几何相似性反映在不变的长宽比和波函数的横向伸长率中,并再现了实验性FSS能量。

著录项

  • 来源
    《Physical review》 |2014年第4期|041304.1-041304.5|共5页
  • 作者单位

    Institute for Integrative Nanosciences, IFW Dresden, Helmholtzstrasse 20, D-01069 Dresden, Germany;

    Central European Institute of Technology, Brno Universite of Technology, Technicka 10, 61600 Brno, Czech Republic;

    Institute for Integrative Nanosciences, IFW Dresden, Helmholtzstrasse 20, D-01069 Dresden, Germany,Institute of Semiconductor and Solid State Physics, Johannes Kepler Universite Linz, Altenbergerstrasse 69, A-4040 Linz, Austria;

    Institute for Integrative Nanosciences, IFW Dresden, Helmholtzstrasse 20, D-01069 Dresden, Germany,Center for Advancing Electronics Dresden (CfAED), Dresden Universite of Technology, 01067 Dresden, Germany;

  • 收录信息
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    quantum dots; quantum dots; collective effects (bose effects, phase space filling, and; exchange interactions;

    机译:量子点;量子点;集体效应(玻色效应;相空间填充和;交换相互作用;

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