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The effect of rashba spin-orbit interaction on optical far-infrared transition of tuned quantum dot/ring systems

机译:Rashba旋转轨道相互作用对调谐量子点/环系统光学远红外转换的影响

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摘要

In the present work, optical properties of tuned quantum dot/ring systems with considering the effect of Rashba spin-orbit interaction are theoretically investigated. To this end, we describe our system by using an appropriate model potential to obtain the energy levels and wave functions analytically. The system is excited by a monochromatic electromagnetic field and intersubband transitions for the electrons are considered. Then, analytical expressions for optical absorption coefficients and refractive index changes are used. The effect of quantum dot radius and the Rashba coupling constant on the optical properties have been investigated. The results show that: (ⅰ) The effect of Rashba spin-orbit interaction on the peak values of the refractive index changes is negligible, (ⅱ) The total absorption coefficient is enhanced and shift toward higher energies with considering the effect of Rashba spin-orbit interaction, (ⅲ) The impact rate of spin-orbit interaction on the optical properties relates to the quantum dot radius, depth of confining potential and the Rashba coupling constant.
机译:在本作工作中,调谐量子点/环系统的光学性质考虑到Rashba旋转轨道相互作用的效果是理论上研究的。为此,我们通过使用适当的模型电位来描述我们的系统来分析能量水平和波函数。该系统由单色电磁场激发,并且考虑了电子的基间转换。然后,使用用于光学吸收系数和折射率变化的分析表达。研究了量子点半径的影响和RASHBA耦合常数对光学性质进行的。结果表明:(Ⅰ)RASHBA旋转轨道相互作用对折射率变化的峰值的影响可忽略不计,(Ⅱ)考虑RASHBA旋转的效果,增强了总吸收系数并转向更高的能量。轨道相互作用,(Ⅲ)光学性质对旋转轨道相互作用的冲击速率涉及量子点半径,限制势深度和RASHBA耦合恒定。

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