抛物量子点中弱耦合杂质束缚磁极化子的光学声子平均数  

Average number of optical phonons of weak-coupling impurity bound magnetopolaron in a parabolic quantum dot

作　　者：胡义嘎[1] 尹辑文[1] 肖景林[2] 

机构地区：[1]赤峰学院物理与电子信息工程系,内蒙古赤峰024000 [2]内蒙古民族大学物理与电子信息学院,内蒙古通辽028043

出　　处：《量子电子学报》2009年第5期636-640,共5页Chinese Journal of Quantum Electronics

基　　金：国家自然科学基金资助项目(10747002)

摘　　要：采用线性组合算符和幺正变换方法研究库仑场对抛物量子点中弱耦合杂质束缚磁极化子的振动频率和光学声子平均数的影响。导出量子点中弱耦合杂质束缚磁极化子的振动频率和光学声子平均数随量子点的有效受限长度、库仑束缚势和磁场的回旋共振频率的变化关系。数值计算结果表明:弱耦合杂质束缚磁极化子的振动频率和光学声子平均数随量子点的有效受限长度的减小而迅速增大,随磁场的回旋共振频率和库仑束缚势的增加而增加,表现出奇特的量子尺寸效应。Influences of the Coulomb field on the vibrational frequency and the mean number of optical phonons of weak-coupling impurity bound magnetopolaron in a parabolic quantum dot are studied using the linear-combination operator and the unitary transformation method. Expressions for the vibration frequency and the mean number of optical phonons of weak-coupling impurity bound magnetopolaron in a parabolic quantum dot as a function of the effective confinement length of quantum dot, the Coulomb bound potential and the cyclotron resonance frequency of magnetic field are derived. Numerical calculations are performed and the results show that the vibration frequency and the mean number or optical phonons of the weak-coupling impurity bound magnetopolaron in a parabolic quantum dot increase rapidly with decreasing of the effective confinement length of quantum dot, and increase with increasing of the cyclotron resonance frequency of magnetic field and the Coulomb bound potential. These can be attributed to the interesting quantum size effects.

关 键 词：光电子学 低维结构 抛物量子点 束缚磁极化子 振动频率 光学声子平均数 

分 类 号：O469[理学—凝聚态物理]