强耦合表面激子内部激发态的性质  

Properties of Internal Excited State of the Strong Coupling Surface Exciton

作　　者：肖景林[1] 

机构地区：[1]内蒙古民族大学物理系,内蒙古通辽028043

出　　处：《发光学报》2003年第1期28-32,共5页Chinese Journal of Luminescence

基　　金：内蒙自然科学基金资助项目 ( 2 0 0 2 0 80 2 0 110 )

摘　　要：采用线性组合算符和幺正变换方法 ,研究极性晶体中强耦合表面激子内部激发态的性质。计算了表面激子的激发态能量、激发能量和平均声子数。The properties of the exciton in the surface layer of crystals influence the properties of crystals very remarkably. In recent years,a lot of authors studied the surface polaron and the surface exciton. The properties of the exciton have been studied by many theoretical method by many investigators.Sumi et al. studied self-trapping of excitons (or electrons)interacting with phonons via short-range potential and found that the self-trapping depends strongly on the degree of lattice freedom.Chen et al. calculated the ground state energy of the strongly bound exciton-phonon system by using a concise variational approach.The influence of the interaction between phonons of different wave vectors in the recoil process on the effective potential between electron and hole, the self-trapping energy, and the self-trapping condition of the exciton in polar crystals has been discussed by using a perturbation method by present authors.Using the nearest-neighbor tight-binding approximation Luban et al. calculated the lowest bound-state energy of the effective 1D electron Hamiltonian and the exciton binding energy is obtained.The results for the exciton binding energy are in very good agreement both with experiment and the results of other theoretical calculations.Kasapoglu et al. calculated the binding energy of the exciton in the symmetric and asymmetric quantum wells by using a variational approach.The third-order nonlinear optical absorptions in hyperbolic quantum wires are studied by Guo et al., with most emphasis devoted to the influence of excitons on the third-order nonlinear optical absorptions. The analytic form for the third-order nonlinear optical absorption coefficient of this system is derived by means of density matrix treatment.A variational calculation of the ground-state energy of neutral excitons and of positively and negatively charged excitons (trions) confined in a single-quantum well is presented by Riva et al. They studied the dependence of the correlation energy and of the binding energy on the well w

关 键 词：强耦合 表面激子 内部激发态 平均声子数 极性晶体 线性组合算符 幺正变换 

分 类 号：O73[理学—晶体学] O471.3