有限深抛物势球型量子点中磁极化子的性质

The Properties of Magnetopolaron in Spherical Quantum Dot in Finite Parabolic Potential

采用平面波展开、幺正变换和变分相结合的方法,研究有限深抛物势球型量子点内磁极化子的性质.理论推导和数值计算表明:磁极化子的基态能量随着耦合强度和量子点半径的增大而减小,随势垒高度和势垒宽度的增加而增大;磁场中极化子的能量较无磁场时的能量增大;且随磁场强度的增加先增大,达到最大值后又下降,出现共振现象.

The properties of magnetopolaron in spherical quantum dot in the finite parabolic potential were studied using expanded potential function as plane waves,unitary transformation and variation methods. The numerical results indicate that the ground state energy of magnetopolaron decreases with increasing coupling strength or radius of quantum dot and increases with increasing width or height of the potential barrier. The numerical results also show that the magnetic field causes the polaron energy to increase,and the ground state energy of magnetopolaron increases firstly to reach the maximum value,then drops with increasing magnetic field strength and appears as a resonance phenomenon.