Neutral and charged biexciton-exciton cascade in near-telecom-wavelength quantum dots
Neutral and charged biexciton-exciton cascade in near-telecom-wavelength quantum dots
复制标题
DOI：
10.1103/physrevb.94.045303
复制
发表时间：
2016-07-08
影响因子：
3.7
通讯作者：
Jahnke, Frank
中科院分区：
文献类型：
--
作者：
Kettler, Jan;Paul, Matthias;Jahnke, Frank
我们调查的级联发射的光子从低密度InGaAs/GaAs量子点生长的金属有机气相外延有意红移向电信波长。我们观察到一个单一的量子点内的多个辐射级联，并将其归因于中性和带电激发配置。相应的过渡相结合的microphotoluminescence和光子相关测量。全组态相互作用的计算进一步支持识别的发射线，并提供有关电子和空穴波函数的限制的额外信息。我们应用蒙特卡罗模拟方法计算了带负电荷的三重态和单重态基态之间的有效自旋散射率。这些自旋翻转过程直接影响所观察到的辐射级联。
We investigate the cascaded emission of photons from low-density InGaAs/GaAs quantum dots grown by metal-organic vapor-phase epitaxy that are intentionally redshifted toward telecommunication wavelengths. We observe multiple radiative cascades within a single quantum dot and attribute these to neutral and charged excited configurations. The corresponding transitions are identified by combining microphotoluminescence and photon correlation measurements. Full-configuration interaction calculations further support the identification of the emission lines and provide additional information about the confinement of electron and hole wave functions. We apply a Monte Carlo simulation to estimate the effective spin scattering rates between excited triplet and singlet ground states of the negatively charged trion. These spin-flip processes directly affect the observed radiative cascade.