Rashba效应下量子点中束缚极化子的有效质量  

Effective mass of bound polaron in quantum dot influenced by Rashba effect

作　　者：赵翠兰[1] 戈君[1,2] 

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 [2]呼伦贝尔学院物理与电子信息学院,内蒙古呼伦贝尔021008

出　　处：《量子电子学报》2013年第3期367-372,共6页Chinese Journal of Quantum Electronics

基　　金：国家自然科学基金(10964005);内蒙古高等学校科研基金(NJzy08085)资助项目

摘　　要：采用线性组合算符、LLP幺正变换和变分方法,研究Rashba效应下量子点中强耦合束缚极化子有效质量的性质。对RbCl量子点数值计算的结果表明:极化子的振动频率、有效质量均随极化子速率、受限强度和库仑束缚势的增大而增大,原因是极化子速率增大电子动能增加,库仑束缚势增大导致电子-声子间相互作用增强,受限强度增大使电子运动的有效范围减小导致电子能量增大,进而使极化子的振动频率和有效质量增大。受Rashba自旋轨道相互作用的影响,极化子的有效质量发生劈裂,劈裂间距随极化子速率的增大而减小。Considering the influence of Rashba effect, which was brought by the spin-orbit interaction, the effective mass of bound polaron with strong-coupling between electron and phonon was expressed as a function of Rashba effect, speed and vibration frequency of polaron by using improved linear combination operator, LLP unitary transformation and variation methods. The numerical calculation results for RbC1 quantum dot indicate that the effective mass and vibration frequency of bound polaron increase with increas- ing speed and confinement strength of polaron, as well as Coulomb bound potential, because of increasing of electronic kinetic energy with increasing polaron speed, enhancing interaction between electron and phonons with strengthening Coulomb bound potential, reducing effective range of electronic motion and increasing electronic kinetic energy with increasing confinement strength of polaron. The numerical calculation results also show that effective mass of bound poalron is split because of Rashba spin-orbit interaction, the splitting difference of effective mass decreases with increasing speed of polaron.

关 键 词：光电子学 有效质量 线性组合算符方法 束缚极化子 Rashba效应 量子点 

分 类 号：O469[理学—凝聚态物理]