Studyof the Spin-Orbit Interaction Effects on Energy Levels and the Absorption Coefficients of Spherical Quantum Dotand Quantum Anti-Dotunderthe Magnetic Field
محورهای موضوعی : فصلنامه نانوساختارهای اپتوالکترونیکیTooraj Ghaffary 1 , Fatemeh Rahimi 2 , Yaghoob Naimi 3 , Hadi Khajehazad 4
1 - Department of Physics, Faculty of Sciences, Shiraz Branch, Islamic Azad University, Shiraz, Iran
2 - Department of Physics, Faculty of Sciences, Shiraz Branch, Islamic Azad University, Shiraz, Iran
3 - Department of Physics, Lamerd Higher Education Center, Lamerd, Iran
4 - Department of Physics, Faculty of Sciences, Shiraz Branch, Islamic Azad University, Shiraz, Iran
کلید واژه: Magnetic Field, Quantum Dot, Absorption Coefficient, Quantum anti-dot, Confinement potential, Spin-orbit interaction,
چکیده مقاله :
In this study, the energy levels of spherical quantum dot (QD) and spherical quantum anti-dot (QAD) with hydrogenic impurity in the center, in the presence of spin-orbit interaction (SOI) and weak external magnetic field have been studied. To this aim, solving the Schrodinger equation for the discussed systems by using the finite difference method, the wave functions and energies of these systems are calculated. Then the effect of the external magnetic field, system radius size and height of potential barrier on the energy levels and also the linear, nonlinear and total absorption coefficients, (ACs), of the mentioned systems are studied. Numerical results show that the SOI in both models causes a split of 2p level into two sub-levels of 2p_(1/2)and 2p_(3/2) where the low index indicates the total angular momentum J. Also, considering the electron spin, under an applied magnetic field, the 1s and 2p levels split into two sub-levels and six sub-levels, respectively. Furthermore, in this research, it is proved that energy changes are significantly different as a function of radius size and height of the potential barrier in QD and QAD models and the ACs of these systems behave differently according to the incident photon energy at the same condition.
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