https://doi.org/10.1140/epjp/i2018-12173-0
Regular Article
Hydrogenic impurity effect on the optical nonlinear absorption properties of spherical quantum dots with a parabolic potential
1
Department of Physics, Guangxi Medical University, Nanning, 530021, Guangxi, China
2
Department of Physics, East Carolina University, 27858, Greenville, NC, USA
3
School of Physics and Electronics, Yancheng Teachers University, 224051, Yancheng, China
4
National Center for International Research of Biological Targeting Diagnosis and Therapy Guangxi Key Laboratory of Biological Targeting Diagnosis and Therapy Research Collaborative Innovation, Center for Targeting Tumor Diagnosis and Therapy Guangxi Medical University, 22 Shuang Yong Rd. Nanning, 530021, Guangxi, China
* e-mail: jianhui831110@163.com
Received:
3
July
2018
Accepted:
31
July
2018
Published online:
3
October
2018
The linear, third-order and total optical absorption coefficients of a hydrogenic impurity in spherical quantum dots subjected to a parabolic potential are calculated by the compact density-matrix approach and the finite difference method. The effect of the potential parameter 
and the confining radius R on the optical absorption coefficients of the spherical quantum dots are investigated. The following conclusions are drawn: 1) The reduction of the size of the quantum dot can lead to a blue-shift of the absorption spectrum no matter whether there is an impurity or not; however, the intensity of the absorption spectrum slightly decreases as an impurity is introduced into the spherical quantum dot. 2) The saturation case of total optical absorption coefficients is observed more easily in the case of weak confinement than in the case of strong confinement; and there is a one-to-one correspondence relationship among the intensity of the absorption peak, the potential parameter and the saturation intensity Is, corresponding to the saturation case of the total optical absorption coefficients. 3) There is an approximate linear relationship between the value of Is and the value of 
as the value of is large.
© Società Italiana di Fisica and Springer-Verlag GmbH Germany, part of Springer Nature, 2018
