电场对三角量子阱中强耦合磁极化子性质的影响  

Influence of the Electric Field on the Properties of Strong-coupling Magnetopolaron in a Triangular Quantum Well

作　　者：单淑萍[1] 陈时华[2] SHAN Shu-ping;CHEN Shi-hua(College of Mechanical and Electrical Engineering, Fujian Longyan University, Longyan 364012, China;Department of Logistics and Information Engineering, Huzhou Vocational Technology College, Huzhou 313000, China)

机构地区：[1]龙岩学院机电工程学院,龙岩364012 [2]湖州职业技术学院物流与信息工程学院,湖州313000

出　　处：《量子光学学报》2018年第2期223-227,共5页Journal of Quantum Optics

基　　金：福建省教育厅A类基金(JA15488);龙岩学院国家基金培育项目(LG2014003)

摘　　要：采用LLP变分法和幺正变换的方法，研究了电场对三角量子阱中强耦合磁极化子性质的影响。通过理论推导得到了极化子基态结合能的表达式，结果显示极化子基态结合能分别是电子一声子耦合强度、电子面密度、磁场回旋频率及电场强度的函数。在不同电场下，通过数值计算分别得到了极化子基态结合能与电子一声子耦合强度、磁场回旋频率及电子面密度之间的函数关系。数值计算结果表明：极化子的基态结合能是电子一声子耦合强度和电场强度的增函数，而且是电子面密度和磁场回旋频率的减函数。By LLP variational method and unitary transformation method, we studied the influence of the electric field on the properties of the strong-couping magnetopolaron in a triangular quantum well. The expression of the polaron＇ s ground state binding energy was obtained through theoretical derivation. The results showed that the polaron＇ s ground state binding energy is a function of the electron-phonon coupling strength, the electron areal density, the magnetic field convolution frequency, and the electric field strength. At different electric field, we derived the relations between the strong-couping magnetopolaron ground state binding energy with the electron-phonon coupling strength, the cyclotron resonance frequency of magnetic field, and the electron areal density, respectively. Our numerical results show that the strong- couping magnetopolaron ground state binding energy is an increasing function of the electron-phonon coupling strength and the electric field, whereas it is a decreasing function of electron areal density and the cyclotron frequency of the magnetic field.

关 键 词：三角量子阱 强耦合磁极化子 电场 

分 类 号：O431[机械工程—光学工程]