非对称量子点中磁极化子声子平均数的温度特性  

Temperature properties of mean number of phonons for magnetopolaron in an asymmetric quantum dot

作　　者：额尔敦朝鲁[1] 张鹏[2] 辛伟[1] 

机构地区：[1]河北科技师范学院凝聚态物理研究所,河北秦皇岛066004 [2]中国石油大学数理系,北京102249

出　　处：《中国石油大学学报（自然科学版）》2009年第4期171-174,共4页Journal of China University of Petroleum(Edition of Natural Science)

基　　金：河北省自然科学基金项目(A2008000463);河北科技师范学院博士基金项目(2006D001)

摘　　要：采用Huybrechts线性组合算符法和Lee-Low-Pines(LLP)幺正变换法,研究了非对称抛物量子点内弱耦合磁极化子的振动频率和声子平均数的温度依赖性。数值计算结果表明,非对称量子点中弱耦合磁极化子的振动频率随量子点的横向受限强度、纵向受限强度和外磁场回旋频率的增加而增大,弱耦合磁极化子的声子平均数随电子-声子耦合强度的增加而增大,随温度的升高而减小。Temperature dependence of the the vibration frequency and the mean number of phonons for weak-coupling magne- topolaron in an asymmetric quantum dot were studied by using Huybrechts＇ linear combination operator and Lee-Low-Pines variation method. Numerical results show that the vibration frequency of weak-coupling magnetopolaron will increase with the longitudinal effective confinement strength, transverse effective confinement strength and the cyclotron frequency increasing. The mean number of phonons for weak-coupling magnetopolaron will increase with the coupling strength increasing and will decrease with the temperature increasing.

关 键 词：非对称量子点 声子平均数 振动频率 温度特性 

分 类 号：O469[理学—凝聚态物理]