抛物阱中束缚极化子的结合能

Binding energy of bound polaron in parabolic quantum well

采用体纵光学(LO)声子近似,利用改进的LLP方法,对两次幺正变换处理电子?LO声子相互作用和施主离子?LO声子相互作用进行了研究.用第一次幺正变换求出极化势;用第二次幺正变换可计算出无限深抛物量子阱中束缚极化子的结合能.结果表明,在阱中心极化势对极化子能量的贡献较大.阱宽较小时,束缚极化子的结合能随阱宽L的增大而急剧减小;阱宽较大时,能量减小缓慢趋近于体材料的三维值.

Using bulk longitudinal optical（LO） phonons approximation and improved LLP method, the interaction of electron with LO phonon and that of ion-donor with LO phonon were investigated by two canonical transformations. By using the first canonical transformation, the polarization potential can be gained. By using the second canonical transformation, the energy of the bound polaron in the infinite PQW could be work out. It was found that the contribution of the polarization potential to the energy of bound polaron was obvious in the center of the well; the binding energy of bound polaron decreased rapidly with well width （L） at the beginning, then decreased very slowly with L, and finally approached to the 3D-value of the bulk.