量子阱中强耦合极化子的性质  

Properties of the Strong Coupling Polaron in a Quantum Well

作　　者：李亚利[1] 肖景林[1] 

机构地区：[1]内蒙古民族大学物理与机电学院,内蒙古通辽028043

出　　处：《光电子．激光》2006年第2期244-247,共4页Journal of Optoelectronics·Laser

基　　金：国家自然科学基金资助项目(10341004)

摘　　要：采用改进的线性组合算符和变分相结合的方法,导出了量子阱中强耦合极化子的振动频率和有效质量;讨论了阱宽和电子-声子耦合强度对强耦合极化子的有效质量的影响以及极化子的速度对振动频率、基态能量、基态结合能和有效质量的影响。通过数值计算结果表明:强耦合极化子的有效质量随阱宽的增加而减少,随电子-声子耦合强度的增加而增大;极化子的振动频率、有效质量和基态结合能随极化子速度的增大而增加,极化子的基态能量随速度的增大而减小。The vibration frequency and effective mass of the strong-coupling polaron in an infinite quantum well were derived by using improved linear-combination-operator and variational method. The effects of well width and electron-LO phonon coupling strength on the effective mass of polaron were discussed, The influence of velocity of polaron on the vibration frequency,ground state energy, ground state binding energy and effective mass were depicted. Numerical calculation illustrates that the effective mass will decrease with increasing well width,and it will increase with increasing the coupling strength;the vibration frequency,ground state binding energy and effective mass of strong-coupling polaron will increase with increasing the velocity of polaron; and the ground state energy decrease with increasing the velocity of polaron.

关 键 词：线性组合算符 强耦合极化子 无限深量子阱 

分 类 号：O469[理学—凝聚态物理]