Continuum transitions and phonon coupling in single self-assembled Stranski-Krastanow quantum dots
Continuum transitions and phonon coupling in single self-assembled Stranski-Krastanow quantum dots
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单个自组装 Stranski-Krastanow 量子点中的连续跃迁和声子耦合
DOI：
10.1103/physrevb.68.235301
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发表时间：
2003
影响因子：
3.7
通讯作者：
G. Bastard
中科院分区：
文献类型：
--
作者：
R. Oulton;J. Finley;J. Finley;A. Tartakovskii;D. Mowbray;M. S. Skolnick;M. Hopkinson;A. Vasanelli;R. Ferreira;G. Bastard
自组装 InGaAs 量子点吸收光谱中的连续跃迁被证明具有内在起源，并且源自润湿层量子阱和量子点限制态之间的跃迁，这与最近的理论预测一致。光谱显示分为两个不同的组，低于 50 meV 对应于理想原子图像中预期的尖锐线跃迁，高于 50 meV 则证明了离散跃迁与连续谱的耦合。还演示了电场控制导致的 LO 声子谐振耦合。
Continuum transitions in the absorption spectra of self-assembled InGaAs quantum dots are demonstrated to have an intrinsic origin, and to arise from transitions between the wetting layer quantum well and quantum dot confined states, in agreement with recent theory predictions. The spectra are shown to fall into two distinct groups, below 50 meV corresponding to sharp line transitions expected in an ideal atom picture, and above 50 meV where coupling of discrete transitions to the continuum is demonstrated. Electric-field-control led resonant coupling to LO phonons is also demonstrated.