Baimuratov Anvar S, Shlykov Alexander I, Zhu Weiren, Leonov Mikhail Yu, Baranov Alexander V, Fedorov Anatoly V, Rukhlenko Ivan D
Opt Lett. 2017 Jul 1;42(13):2423-2426. doi: 10.1364/OL.42.002423.
We use quantum theory of molecular crystals to study collective excitations (excitons) of gyrotropic quantum-dot (QD) supercrystals with complex lattices consisting of two or more sublattices of semiconductor QDs. We illustrate the potentials of our approach by applying it to analytically calculate the linear permittivity tensor of supercrystals with two QDs per unit cell. The spatial dispersions of exciton energy bands and permittivity tensor components are examined in detail for two-dimensional supercrystals with a square lattice, which are relatively easy to fabricate in practice. Our results provide a systematic and versatile framework for the engineering of dispersion properties of gyrotropic QD supercrystals and for the analysis of their absorption and circular dichroism spectra.
我们运用分子晶体的量子理论来研究具有复杂晶格的旋光量子点（QD）超晶体的集体激发（激子），该复杂晶格由两个或更多半导体量子点子晶格组成。我们通过将其应用于解析计算每个晶胞有两个量子点的超晶体的线性介电常数张量，来说明我们方法的潜力。对于具有方形晶格的二维超晶体，详细研究了激子能带和介电常数张量分量的空间色散，这种二维超晶体在实际中相对容易制备。我们的结果为旋光量子点超晶体色散特性的工程设计以及其吸收光谱和圆二色光谱的分析提供了一个系统且通用的框架。
