Fonoberov Vladimir A, Pokatilov Evghenii P, Fomin Vladimir M, Devreese Jozef T
Laboratory of Physics of Multilayer Structures, Department of Theoretical Physics, State University of Moldova, A. Mateevici 60, MD-2009 Chişinău, Moldova.
Phys Rev Lett. 2004 Mar 26;92(12):127402. doi: 10.1103/PhysRevLett.92.127402. Epub 2004 Mar 24.
Taking into account the tetrahedral shape of a quantum-dot quantum well (QDQW) when describing excitonic states, phonon modes, and the exciton-phonon interaction in the structure, we obtain within a nonadiabatic approach a quantitative interpretation of the photoluminescence spectrum of a single CdS/HgS/CdS QDQW. We find that the exciton ground state in a tetrahedral QDQW is bright, in contrast to the dark ground state for a spherical QDQW. The position of the phonon peaks in the photoluminescence spectrum is attributed to interface optical phonons. We also show that the experimental value of the Huang-Rhys parameter can be obtained only within the nonadiabatic theory of phonon-assisted transitions.
在描述量子点量子阱（QDQW）结构中的激子态、声子模式以及激子 - 声子相互作用时，考虑到量子点量子阱的四面体形状，我们在非绝热方法内对单个CdS/HgS/CdS量子点量子阱的光致发光光谱进行了定量解释。我们发现，与球形量子点量子阱的暗基态相反，四面体量子点量子阱中的激子基态是亮的。光致发光光谱中声子峰的位置归因于界面光学声子。我们还表明，只有在声子辅助跃迁的非绝热理论范围内才能获得黄 - 里斯参数的实验值。
