摘要
研究了半导体量子点中极化子的有效质量 .采用改进的线性组合算符方法 ,导出在电子 -体纵光学声子 (L O)强耦合时抛物量子点中极化子的振动频率、相互作用能和有效质量随受限强度和电子 -声子耦合强度的变化 .对Rb Cl晶体量子点进行了数值计算 ,结果表明 ,量子点受限越强 ,半导体量子点中强耦合极化子的振动频率和有效质量就越大 ;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 。
The properties of the effective mass of polaron in semiconductor quantum dot are studied.The relations between the vibration frequency,the interaction energy and the effective mass of the polaron at the electron-LO phonon strong coupling in parabolic quantum dot with the confinement strength and the electron-phonon coupling strength are derived by using an improved liner combination operator method.Numerical calculations for RbCl crystal are performed and the results show that the vibration frequency and the effective mass will increase with the confinement strength increasing.Whereas the interaction energy is harshly increased until the confinement strength reaches a certain value,then it will sharply decrease.
基金
国家自然科学基金资助项目 (批准号 :10 3 470 0 4)~~
关键词
半导体量子点
极化子
受限强度
有效质量
semiconductor quantum dot
polaron
bound power
effective mass
