非对称量子点中强耦合束缚磁极化子的基态寿命  

Ground-State Lifetime of Strong-Coupling Bound Magnetopolaron in Asymmetrical Quantum Dot

作　　者：李志新[1] 肖景林[1,2] 

机构地区：[1]河北科技师范学院数理系,河北秦皇岛066004 [2]内蒙古民族大学电子与信息学院,内蒙古通辽市028043

出　　处：《光学学报》2008年第12期2416-2419,共4页Acta Optica Sinica

基　　金：河北科技师范学院博士基金(2006D001)资助课题

摘　　要：采用线性组合算符和幺正变换方法,研究了非对称量子点中电子和体纵光学声子强耦合下束缚磁极化子的性质。得到了非对称量子点中强耦合束缚磁极化子的基态能量。讨论了量子点横向和纵向受限长度,磁极化子基态能量,电子-声子耦合强度和外界温度对磁极化子基态寿命的影响。由于电子-声子相互作用和外界温度的影响导致了量子体系的跃迁,即磁极化子吸收了声子的能量由基态跃迁到激发态,造成极化子在基态的寿命发生变化。通过计算发现束缚磁极化子基态寿命随基态能量的增加而变大,随电子-声子耦合强度,量子点横向和纵向受限长度,外界温度的增加而变小。The properties of bound magnetopolaron with strong electron-LO phonon coupling were studied using a linear combination operator and a unitary transformation method in an asymmetry quantum dot. The ground state energy of strong-coupling bound magnetopolaron was obtained in an asymmetry quantum dot and the effects of the transverse and longitudinal confinement lengths of quantum dot, the ground state energy of magnetopolaron , the electron-phonon coupling strength and the external temperature on the ground state lifetime of magnetopolaron were discussed. Quantum transition which causes the changes of the magnetopolaron lifetime is occurred in the quantum system due to the electron-phonon interaction and the influence of external temperature which is the magnetopolaron leap from the ground state to the first-excited state after absorbing a LO-phonon. Numerical calculations are performed and the results show that the ground state lifetime of bound magnetopolaron is extended with the rise of the ground state energy, and shortened with the electron-phonons coupling strength, the transverse and longitudinal confinement lengths of quantum dot , and the external temperature.

关 键 词：量子光学 非对称量子点 束缚磁极化子 基态寿命 线性组合算符 

分 类 号：O431[机械工程—光学工程]