ABSTRACT

Non-uniform height semiconductor quantum rings are studied in order to determine their electronic and optical absorption properties. Theoretical modelling of the structure includes an analytical description of the non-regular multi-hilled confining potential as well as the presence of repulsive scattering centre and external crossing electric and magnetic fields. We have discussed the features of localised and extended (rotational, Aharonov–Bohm-like) states in the presence of the magnetic field. A modification of the spectrum, with the appearance of a Stark-like behaviour, and its corresponding modification related to the repulsive potential is analysed when the electric field effect is considered. In double-hilled structures, these properties of the energy spectrum are of main importance in explaining the apparent optical transparency induced within a certain range of the electric field strength. The presence of the repulsive centre is found to cause a moderate redshift of the light absorption response.

抽象的

研究了不均匀高度的半导体量子环，以确定它们的电子和光学吸收特性。该结构的理论建模包括对非规则多坡约束势的分析描述，以及排斥中心和外部交叉电场和磁场的存在。我们已经讨论了在磁场存在下局部和扩展（旋转，Aharonov–Bohm样）状态的特征。当考虑电场效应时，分析具有斯达克行为的频谱的修改及其与排斥势有关的相应修改。在双坡结构中 能谱的这些特性对于解释在一定电场强度范围内引起的表观光学透明性至关重要。发现排斥中心的存在引起光吸收响应的适度红移。