Phonon-induced exciton dephasing in quantum dot molecules.
Phonon-induced exciton dephasing in quantum dot molecules.
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DOI：
10.1103/physrevlett.95.177405
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发表时间：
2005-05
影响因子：
8.6
通讯作者：
E. Muljarov;E. Muljarov;T. Takagahara;Roland Zimmermann
中科院分区：
文献类型：
--
作者：
E. Muljarov;E. Muljarov;T. Takagahara;Roland Zimmermann
发展了一种新的量子点和量子点分子光学跃迁的微观方法，该方法考虑了对角和非对角激子-声子相互作用。将线偏振的累积展开推广到多能级系统，并应用于计算偏振态和吸收谱的全时相关性。特别是，零声子线的加宽直接评估和讨论的真实的和虚拟的声子辅助跃迁。分析了库仑相互作用、隧穿效应和结构不对称性对量子点分子中激子退相的影响。
A new microscopic approach to the optical transitions in quantum dots and quantum dot molecules, which accounts for both diagonal and nondiagonal exciton-phonon interaction, is developed. The cumulant expansion of the linear polarization is generalized to a multilevel system and is applied to calculation of the full time dependence of the polarization and the absorption spectrum. In particular, the broadening of zero-phonon lines is evaluated directly and discussed in terms of real and virtual phonon-assisted transitions. The influence of Coulomb interaction, tunneling, and structural asymmetry on the exciton dephasing in quantum dot molecules is analyzed.