量子线中弱耦合束缚极化子的性质  

Properties of Weak-coupling Bound Polaron in Quantum Wire

作　　者：何锐[1] 吴志永[1] 孙勇[1] 丁朝华[1] 

机构地区：[1]内蒙古民族大学物理与电子信息学院,内蒙古通辽028043

出　　处：《内蒙古民族大学学报（自然科学版）》2010年第5期491-494,共4页Journal of Inner Mongolia Minzu University：Natural Sciences

基　　金：内蒙古自然科学基金资助项目(20080404MS0109)

摘　　要：采用改进的线性组合算符和幺正变换方法研究了库仑场对抛物量子线中弱耦合极化子性质的影响.计算了抛物量子线中弱耦合束缚极化子的基态能量、振动频率和声子平均数.讨论了这些量对库仑束缚势和约束强度的依赖关系.数值结果表明:量子线中弱耦合极化子的基态能量随库仑束缚势的增加而减少,随约束强度的增加而增大;振动频率随库仑束缚势的增加而增加,随约束强度的增加而增大;声子平均数随着约束强度的增加而增加,随库仑束缚势的增加而减少.The properties of weak-coupling bound polaron in a parabolic quantum wire are studied by using the linear combination operator and the unitary transformation methods.The ground state energy,the vibrational frequency and the mean number of optical phonons are expressed as a function of the confinement strength of quantum wire and the Coulomb bound potential.Numerial calculations are performed and the results show that the ground state energy will decrease with increasing the Coulomb bound potential and it will increase with increasing the confinement strength,whereas the mean number of optical phonons too.The vibrational frequency will increase with increasing the Coulomb bound potential and it will increase with increasing the confinement strength.

关 键 词：量子线 束缚极化子 弱耦合 声子平均数 

分 类 号：O469[理学—凝聚态物理]