磁场对抛物量子点中极化子内部激发态的影响  

The Influences of the Magnetic Field on the Internal Excited State of the Polaron in the Parabolic Quantum Dot

作　　者：乌云其木格[1] 杨洪涛[1] 额尔敦朝鲁[2] 

机构地区：[1]内蒙古民族大学物理与机电学院,内蒙古通辽028043 [2]河北科技师范学院数理系,河北秦皇岛066004

出　　处：《固体电子学研究与进展》2007年第3期285-289,共5页Research & Progress of SSE

基　　金：内蒙古自然科学基金(批准号:200208020110);河北科技师范学院博士基金(批准号:2006D001)资助课题

摘　　要：采用线性组合算符和幺正变换方法研究了外场对抛物量子点中极化子的激发态性质的影响,导出了强、弱耦合情况下极化子的第一内部激发态能量E1、激发能量ΔE、共振频率ω与量子点的有效受限长度l0、电子-声子耦合强度α以及外场B的关系。数值计算结果表明,不论强、弱耦合,磁场中量子点内极化子的λ、E1、ΔE和ω都随l0的减小而增大,而且都随回旋频率ωc(磁场B)的增大而增加。另外,在弱耦合情形下,λ、ΔE和ω均与α无关,而E1随α的增大而减小。相反,在强耦合情形下,λ、E、ΔE和ω均随α的增大而增加。The influences of the external magnetic field on the properties of the excited state of the polaron in a parabolic quantum dot are studied by using the linear combination operator and the unitary transformation method, the relation of the first internal excited state energy E1, excited energy AE and the resonance frequency 02 of both the strong-and weak-coupling polaron with the effective confinement length lo of the quantum dot, the electron-phonon coupling strength a and external magnetic field B are derived. Numerical calculation results show that,λ, E1,ΔE and ω of both the strong-and weak-coupling polaron in quantum dot under the magnetic field will increase with decreasing lo of the quantum dot, and will increase with increasing the cyclotron frequency ωc（magnetic field B）. In addition, for weak-coupling case, λ,ΔE and ω of polaron have no connection with α, and E1 will decrease with increasing α. On the contrary, for strong-coupling case,λ,E1 ,ΔE and ω of polaron will increase with increasing α.

关 键 词：抛物量子点 极化子 第一内部激发态能量 激发能量 共振频率 

分 类 号：O471.4[理学—半导体物理]