柱形量子线中极化子的电子与LO声子之间相互作用能  

Electron-phonon Interaction Energies of Polaron in Cylindrical Quantum Wires

作　　者：丁朝华[1] 肖景林[1] 

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

出　　处：《发光学报》2003年第5期501-504,共4页Chinese Journal of Luminescence

基　　金：内蒙古自然科学基金资助项目(200208020110)

摘　　要：采用变分法,研究了柱形量子线中在考虑电子与LO声子相互作用的情况下,极化子在基态时系统的能量以及电子 LO声子之间的相互作用能。数值计算结果表明:随着柱形量子线截面半径的减小,基态能量和电子 LO声子相互作用能的绝对值都增大。In recent years, the development of molecularbeam epitaxy techniques and metalorganic chemicalvapor deposition techniques have made possible the fabrication of quantum well structures in which the electrons are confined to move in one or two dimensions. Due to their small sizes these structures present some special physical properties. Optical and electronic properties of quantum wells, quantum wires and quantum dots have been the subject of both theoretical and experimental investigations in recent years. Polaron in quantum wires are markedly different from those in bulk materials, due to the presence of wire potentials with the form V, which confine the carriers motion in the ρplane transverse to the wire axis. The confining potential may bring out many rich phonon modes such as confined phonon modes, interface phonon modes, etc. Even for the confined phonon itself, there are so many types: rectangular, cylindrical and parabolic types. A variety of phonon modes and various types of the wire potential have given rise to rich and varied investigations in this field. For the energies of polaron problems in QW, few author studied energies of polaron itself. In this paper, by solving the effective mass equation with the variational method, we have studied the ground state energies and the electronphonon interaction energies of polaron in cylindrical quantum wires.The energies of the ground state and the absolute value of the electronLO phonon interaction energies were given. The numerical results show, with the decreasing radius of the quantum wires, the ground state energies and the absolute value of the electronLO phonon interaction energies increase mononically.

关 键 词：量子线 极化子 变分法 基态能量 低维半导体材料 电子-LO声子耦合 相互作用能 

分 类 号：O472.2[理学—半导体物理] TN304[理学—物理]