Impurity-Related Optical Response in Quantum Ring with Magnetic Field |
| Kang Yun, Wang Sheng
School of Physics and Electronic Engineering, Northeast Petroleum University, No. 99 Xuefu Street, 163318, Daqing, China |
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| The optical absorption of the donor impurity in the two-dimensional GaAs quantum ring was studied with the effective mass approximation using the finite element method. The influence of the magnetic field, light intensity, and impurity position on the optical absorption coefficient is analyzed. The results reveal that the application of a magnetic field can increase the peak value of the absorption coefficient and cause a blue shift phenomenon. With the increase of light intensity, the peak splitting in total optical absorption appears. With the increase of the distance between the impurity and the center of the quantum ring, the spacing of the energy level decreases, resulting in a decrease in the peak value of the total absorption coefficients, and a red shift occurs. On the other hand, when the impurity is located between the inner and outer radius, the opposite effects appear as the impurity is far from the center of the quantum ring. |
DOI:10.12693/APhysPolA.142.242 topics: donor impurity, magnetic field, refractive index changes, absorption coefficient |