Hydrogenic impurity-related optical properties in a piezoelectric core-shell nanowire
Hydrogenic impurity-related optical properties in a piezoelectric core-shell nanowire
复制标题
压电核壳纳米线中与氢杂质相关的光学特性
DOI：
10.1063/1.5145227
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发表时间：
2020-07-21
影响因子：
3.2
通讯作者：
Zhu, J.
中科院分区：
文献类型：
--
作者：
Ha, S. H.;Zhu, J.
利用密度矩阵方法研究了压电核壳纳米线中杂质相关的光学跃迁。在计算中，四个电子状态被认为是使用有限差分算法结合变分方法。一个明显的蓝移的光谱，特别是从自由电子到杂质束缚基态的过渡，被预测的压电场诱导的本征斯塔克效应的结果。杂质束缚态之间的光学跃迁对纤锌矿纳米线的吸收系数和折射率的影响随着压电极化的增强而增强。研究结果对进一步研究压电纳米线的线性和非线性光学性质具有指导意义。
The impurity-associated optical transitions in a piezoelectric core-shell nanowire were studied using the density matrix formalism. In the calculations, four electron states were considered using a finite-difference algorithm combined with a variational approach. An obvious blueshift in the optical spectrum, especially for the transition from the free electron to impurity-bound ground states, was predicted to result from the intrinsic Stark effect induced by the piezoelectric field. The effects of the optical transition between impurity-bound states on the absorption coefficient and the refractive index of wurtzite nanowires were enhanced as the piezoelectric polarization becomes stronger. The findings are helpful for guiding further experiments on the linear and nonlinear optical properties of piezoelectric nanowires.