磁场中量子点内弱耦合磁极化子基态束缚能的温度依赖性  

Temperature Dependence of the Ground State Binding Energy of the Weak-coupling Magnetopolaron in a Quantum Dot Within Magnetic Fields

作　　者：乌云其木格[1] 刘宝海[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：《发光学报》2009年第2期152-156,共5页Chinese Journal of Luminescence

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(A2008000463);河北科技师范学院博士基金(2006D001)资助项目

摘　　要：用线性组合算符法、LLP变换法和量子统计的方法,研究了温度对磁场中抛物量子点内弱耦合磁极化子的影响,得到了磁极化子基态能量和基态束缚能量与量子点的受限强度、回旋频率和温度的依赖关系。数值计算结果表明,磁极化子的基态束缚能量|Eb|随回旋频率ωc的增加而增大,随温度参量γ的增加而减小,|Eb|随γ的增加而减小的幅度,不仅与γ的取值范围有关,而且还与ωc有显著关系,|Eb|显著变化的γ范围随ωc的增加而减小。Quantum dot system has attracted a lot of attention as a possible candidate for the parts of an apparatus of quantum function, due to the potential applications foreground and a great deal of novel optoelectronic and transport properties. But owing to the research of electronic properties in quantum dot being very impor- tant, so more and more researchers started to study the quantum dot properties both theoretically and experi- mentally. However, for the convenience, in those works, people only confine themselves to discuss zero Kelvin limit condition. In fact, researching the excitation properties in low-dimension structures under finite tempera- ture is considerably important for improving and enhancing the calorifics performance of fundamental elements. In this paper, the influences of temperature on magnetopolaron in parabolic quantum dot were studied by using the methods of a linear combination operator, LLP transformation, and quantum statistics, and the dependences of the ground state energy of magnetopolaron and the ground state bound energy to the confinement strength of quantum dot, the cyclotron frequency （magnetic field） and the temperature were obtained. Numerical calcula- tion results illustrate that： （1） The ground state bound energy [Eb ] of magnetopolaron increases with the increasing of cyclotron frequency. （2） Although the changes of ground state energy/Eb/in a magnetic field with cyclotron frequency ωo are related to the temperature parameter γ, but the change laws of the /Eb/ for different γ as a function of ωo are similar. （3） The ground state bound energy /Eb/ in a magnetic field decreases with the increasing of tempera- ture parameter 3＇. Generally, the change of the ground state bound energy /Eb/ with temperature parameter γ is more obvious when the temperature parameter γ is smaller, but the change of the [ Eb] with γ is not remarkable when the temperature parameter γ is bigger. （4） The scope of the ground state bound energy /Eb/ of magnetopolaron decr

关 键 词：抛物量子点 弱耦合磁极化子 基态束缚能量 温度依赖 

分 类 号：O469[理学—凝聚态物理] O472.3[理学—电子物理学]