砷化物三元混晶中电子-声子相互作用的维度和体积效应  

The Dimension and Volume Effect on the Electron-Phonon Coupling in Ternary Mixed Crystal of Arsenic Compounds

作　　者：段晓峰[1] 樊云鹏[1] 侯俊华[1] 

机构地区：[1]山西师范大学物理与信息工程学院,山西临汾041000

出　　处：《激光杂志》2016年第10期10-13,共4页Laser Journal

基　　金：国家自然科学基金(11147159)

摘　　要：通过导出描述三维、二维和一维混晶中电子-声子相互作用的哈密顿量,讨论了砷化物三元混晶中原胞体积效应与电子-声子耦合强度和原胞体积失配率的关系。结果表明:电子-声子耦合越强,原胞失配率越大,体积效应越明显;只有原胞体积失配率较小和电子-声子的耦合强度较弱时,体积效应的影响是可以略去的;由于维度受限增强了电子-声子相互作用强度,二维光学极化子效应的非线性变化比三维的更明显;而一维光学极化子效应的非线性变化比三维和二维情形要弱。The electron-optical-phonon （e-p） interaction Hamiltonians between an electron and two branches of LO-phonon modes in three-dimensional （3D）, two-dimensional （2D） and one-dimensional （ 1 D） ternary mixed crystal （TMC） of Arsenic compounds are derived out. The relation between the unit-cell volume variation effect and mismatch of the unit-cell volumes of the end-member materials, as well the e-p coupling of the Arsenic compounds TMC is discussed. It is verified theoretically that the obvious nonlinearity of the polaronic energy and effective mass with the composition is essential and the unit-cell volume effects cannot be neglected except the week e-p coupling. Due to the reduced dimension of the material strengthen the e-p coupling in the TMC, the polaronic nonlinearity in 2D Arsenic compounds TMC is more obviously than that in 3D case. The nonlinearity in 1D Arsenic compounds TMC is weaker than that in 3D and 2D cases.

关 键 词：电子-光学声子相互作用 极化子能量 原胞体积效应 

分 类 号：TN209[电子电信—物理电子学]