Intersubband optical refractive index changes in an asymmetric quantum dot underlying an external static magnetic field
- 作者：Xue Chao Li ; xuechao@mail.ustc.edu.cn ; An Min Wang anmwang@ustc.edu.cn ; Zhao Liang Wang ; Yang Yang
- 关键词：Refractive index change ; Quantum dot ; Magnetic field
- 刊名：Superlattices and Microstructures
- 出版年：2012
- 期刊代码：122_07496036
- 类别：ms
- 出版时间：May, 2012
- 卷：51
- 期：5
- 页码：580-586
- 文件大小：449 K
摘要
We theoretically investigate the refractive index (RI) changes in an asymmetric quantum dot (QD) underlying an external static magnetic field. We obtain the confined wave functions and energies of an electron in QD by the effective-mass approximation. Using the compact-density-matrix approach and iterative method, we obtain the analytical expressions of linear, nonlinear and total RI changes. The results of numerical calculations for the typical GaAs/AlGaAs QD show that the RI changes are sensitive to the parameters of the asymmetric potential and incident optical intensity. Moreover, the resonance peaks of the RI changes shift with the value of magnetic field B or the radius of the QD changing.