杂质对半指数量子阱中弱耦合极化子振动频率的影响

Effect of Impurity on Vibrational Frequency of Weak Coupling Polaron in Asymmetrical Semi-exponential Quantum Wells

在非对称半指数量子阱中心存在类氢杂质以及考虑系统处于弱耦合情况下,研究了这种半指数势的量子阱中极化子振动频率的基本性质.运用线性组合算符方法,并且结合两次幺正变换对哈密顿量进行运算,选择Ga As晶体,计算了非对称半指数量子阱中弱耦合极化子的振动频率随库仑势和半指数受限势的两个参量的变化关系.结果显示了库仑势、半指数受限势的参量U0和参量σ对非对称半指数量子阱振动频率的影响.

With a hydrogen-like impurity in the asymmetrical semi-exponential quantum well,we studied the properties of the vibrational frequency of the weak coupling polaron in a Ga As asymmetrical semi-exponential quantum well. The relation of vibration frequency with Coulomb potential and semi-exponential confinement potential in asymmetric semi-exponential quantum well was calculated using linear a combination operator method and combining the two times unitary transformations to calculate the Hamiltonian and choosing the Ga As crystal. The numerical results indicate that the Coulomb impurity potential,the parameter U0 of the confinement potential and the other parameter σ affect the vibrational frequencyof the asymmetrical semi-exponential quantum well.