Rashba效应影响下半导体量子点中强耦合极化子的声子平均数  

Mean Number of Optical Phonons of Strong-coupling in a Parabolic Quantum Dot Induced by Influence of Rashba Spin-orbit Interaction

作　　者：白瑞锋[1] 马新军[1] 肖景林[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）》2008年第5期484-487,共4页Journal of Inner Mongolia Minzu University：Natural Sciences

基　　金：国家自然科学基金项目(10347004);内蒙古高校科研基金资助项目(NJ02074)

摘　　要：采用改进的线性组合算符方法,研究了Rashba效应影响下半导体量子点中强耦合极化子的光学声子平均数.导出在电子-体纵光学声子(LO)强耦合时抛物量子点中极化子的光学声子平均数、振动频率、相互作用能和有效质量随受限强度和Rashba自旋-轨道耦合常数的变化.数值计算结果表明Rashba自旋-轨道相互作用使极化子的有效质量、基态能分裂为上下两支,随耦合常数的增加极化子基态能量、有效质量表现为增加和较少两种截然相反的情形;Rashba自旋-轨道相互作用影响下强耦合极化子的光学声子平均数随量子点的受限强度、电子声子耦合强度增大而增大,极化子的相互作用能随受限强度的增加先急剧增加,当达到极值后随受限强度的增加而急剧减少.In this paper, average number of optical phonons of strong- coupling in a parabolic quantum dot induced by influence of Rashba spin- orbit interaction is studied. The relations of the strength of confinement, the interaction energy and the effective mass of the polaron in the electron - LO phonon strong coupling region in a parabolic quantum dot on the vibration frequency is derived by using improved liner combination operator method, numerical calculations for RbCI crystal are performed and the results show that the Rashba SO interaction makes the ground state energy and the effective mass of polaron split into two branches; the ground splitting energy and the effective mass will increase with the vibration frequency increasing. Whereas the interaction energy is sharply increased until the confinement strength reaches a certain value, then it will sharply decrease.

关 键 词：Rashba自旋-轨道相互作用 光学声子平均数 

分 类 号：O469[理学—凝聚态物理]