Anisotropic optical emission of single CdSe/CdS tetrapod heterostructures: Evidence for a wavefunction symmetry breaking
Anisotropic optical emission of single CdSe/CdS tetrapod heterostructures: Evidence for a wavefunction symmetry breaking
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DOI：
10.1103/physrevb.77.153303
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发表时间：
2008-04-01
影响因子：
3.7
通讯作者：
Talapin, D. V.
中科院分区：
文献类型：
--
作者：
Mauser, C.;Limmer, T.;Talapin, D. V.
半导体四角体由于其四面体对称性而被期望表现出各向同性的光学性质。我们研究了高结构质量的单个CdSe/CdS四脚体的光学偏振特性。与光吸收行为相反，在光发射中观察到明显的各向异性。这个意外的结果只能通过假设电子波函数的对称性破缺来解释。计算表明，臂直径之间的微小差异诱导偏振发射和光致发光强度的降低。
Semiconductor tetrapods are expected to exhibit isotropic optical properties due to their tetrahedral symmetry. We have investigated the optical polarization properties of individual CdSe/CdS tetrapods of high structural quality. In contrast to the light absorption behavior, a pronounced anisotropy is observed in the optical emission. This unexpected result can only be explained by assuming a symmetry breaking in the electronic wavefunction. Calculations reveal that slight differences between the arm diameters induce the polarized emission and a decrease in the photoluminescence intensity.