量子棒中极化子声子平均数的温度依赖性  

Temperature Dependence of the Mean Phonon Number of the Polaron in a Quantum Rod

作　　者：乌云其木格[1] 王晓昱[2] 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,内蒙古通辽028043 [2]河北科技师范学院凝聚态物理研究所,河北秦皇岛066004

出　　处：《固体电子学研究与进展》2010年第2期188-191,共4页Research & Progress of SSE

基　　金：半导体超晶格国家重点实验室开放研究课题(CHJG200701);河北省自然科学基金资助项目(A2008000463)

摘　　要：采用Huybrechts线性组合算符和Lee-Low-Pines变分法,研究了温度对量子棒中强耦合极化子平均声子数和振动频率的影响。结果表明,量子棒中强耦合极化子的平均声子数N-和振动频率λ随量子棒纵横比e′、温度T的增加而减小,随电子-声子耦合强度α和受限强度Ω∥的增加而增大。温度对平均声子数N-和振动频率λ的影响只是在温度较高(γ<1.0)时较显著,而在温度较低(γ>1.0)下并不显著。The temperature influences on the mean phonon number and the vibration frequency of the strong-coupling polaron in a quantum rod are studied by using the Huybrechts＇ linear combination operator and the Lee-Low-Pines variational method in this paper.Our results show that the mean number and the vibration frequency λ decrease with increasing the aspect ratio e′ and temperature T and inecrease with increasing coupling strength α and the confinement strength Ω∥.Only on the condition of high temperature（γ1.0）,the temperature influence on the mean phonon number and the vibration frequency λ of the strong-coupling polaron is obvious,but this is not so when γ1.0.

关 键 词：量子棒 强耦合极化子 平均声子数 振动频率 温度依赖性 

分 类 号：O469[理学—凝聚态物理]