温度对抛物量子点中强耦合磁极化子性质的影响  

Influence of temperature on the properties of the strong-coupling magnetopolaron in a parabolic quantum dot

作　　者：乌云其木格[1] 额尔敦朝鲁[2] 

机构地区：[1]内蒙古民族大学物理与电子信息学院,通辽市028043 [2]河北科技师范学院数理系,秦皇岛市066004

出　　处：《原子与分子物理学报》2008年第4期827-832,共6页Journal of Atomic and Molecular Physics

基　　金：河北省自然科学基金(A2008000463);半导体超晶格国家重点实验室开放研究课题(CHJG200701);河北科技师范学院博士基金项目(2006D001)

摘　　要：采用线性组合算符法和LLP变换法,研究了温度对抛物量子点中强耦合磁极化子性质的影响,首次得到了抛物量子点中强耦合磁极化子的基态能量和振动频率随温度的变化规律.结果表明,量子点中强耦合磁极化子的振动频率随温度的升高而减小,随量子点的受限强度、回旋频率和耦合强度的增加而增大.而基态能量随回旋频率、耦合强度和温度变化的规律与磁极化子的状态性质密切相关.磁极化子基态能量和振动频率随量子点的受限强度、回旋频率和耦合强度的变化情况受温度的显著影响,不过,温度对磁极化子基态能量和振动频率的影响只有在较高温度(0<γ<0.5)时才显现.The influences of the temperature on the properties of the strong-coupling magnetopolaron in a parabolic quantum dot are studied by using the linear combination operator and the LLP variational method. The cyclotron frequency and coupling constant are derived. In particular, the law of the change of the ground state energy and the vibration frequency of the strong-coupling magnetopolaron in a parabolic quantum dot changing with temperature are obtained for the first time. Numerical results indicate that the vibration frequency of the magnetopolaron will decrease with increasing temperature and will increase with increasing confinement strength, the cyclotron frequency and coupling strength. The changes of the ground state energy with the cyclotron frequency, coupling strength and temperature are srongly related to the propties of the state of the magnetopolaron. The influence of temperature is greater to the change of the ground state energy and the vibration frequency of the magnetopolaron changing with the confinement strength, the cyclotron frequency and coupling constant. Only on the condition of high temperature （0〈 γ〈0.5）, the influence of temperature to the ground state energy and the vibration frequency of the magnetopolaron is obvious, but this is not so when γ〈0.5.

关 键 词：抛物量子点 强耦合磁极化子 温度依赖性 

分 类 号：O471.4[理学—半导体物理]