...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Physical review >Exciton spin dynamics in spherical CdS quantum dots
【24h】

Exciton spin dynamics in spherical CdS quantum dots

机译：球形CdS量子点中的激子自旋动力学

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

Exciton spin dynamics in quasispherical CdS quantum dots is studied in detail experimentally and theoretically. Exciton states are calculated using the six-band k·p Hamiltonian. It is shown that for various sets of Luttinger parameters, when the wurtzite lattice crystal-field splitting and Coulomb interaction between the electron-hole pair are taken into account exactly, both the electron and hole wave functions in the lowest exciton state are of S type. This rules out the spatial-symmetry-induced origin of the dark exciton in CdS quantum dots. The exciton bleaching dynamics is studied using time- and polarization-resolved transient absorption technique of ultrafast laser spectroscopy. Several samples with a different mean size of CdS quantum dots in different glass matrices were investigated. This enabled the separation of effects that are typical for one particular sample from those that are general for this type of material. The experimentally determined dependence of the electron-spin-relaxation rate on the radius of quantum dots agrees well with that computed theoretically.
机译：通过实验和理论研究了准球形CdS量子点中的激子自旋动力学。激子态是使用六波段k·p哈密顿量计算的。结果表明，对于各种Luttinger参数，当精确考虑纤锌矿晶格分裂和电子-空穴对之间的库仑相互作用时，最低激子态的电子和空穴波函数均为S型。 。这排除了CdS量子点中暗激子的空间对称性诱发起源。使用超快激光光谱的时间分辨和偏振分辨瞬态吸收技术研究了激子漂白动力学。研究了在不同玻璃基质中具有不同平均尺寸的CdS量子点的几个样品。这样就可以将一种特定样品的典型效应与此类材料的一般效应分开。实验确定的电子自旋弛豫速率对量子点半径的依赖性与理论计算的相符。

著录项

  • 来源
    《Physical review》 |2010年第4期|045301.1-045301.12|共12页
  • 作者

    P. Horodyska; P. Nemec; D. Sprinzl; P. Maly; V. N. Gladilin; J. T. Devreese;

  • 作者单位

    Faculty of Mathematics and Physics, Charles University in Prague, Ke Karlovu 3, 121 16 Prague 2, Czech Republic;

    rnFaculty of Mathematics and Physics, Charles University in Prague, Ke Karlovu 3, 121 16 Prague 2, Czech Republic;

    rnFaculty of Mathematics and Physics, Charles University in Prague, Ke Karlovu 3, 121 16 Prague 2, Czech Republic;

    rnFaculty of Mathematics and Physics, Charles University in Prague, Ke Karlovu 3, 121 16 Prague 2, Czech Republic;

    rnTheoretische Fysica van de Vaste Stoffen, Departement Fysica, Universiteit Antwerpen, Groenenborgerlaan 171, B-2020 Antwerpen,Belgium;

    Theoretische Fysica van de Vaste Stoffen, Departement Fysica, Universiteit Antwerpen, Groenenborgerlaan 171, B-2020 Antwerpen,Belgium;

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

    quantum dots; spin relaxation and scattering; excitons and related phenomena;

    机译：量子点;自旋弛豫和散射;激子及相关现象;

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