在极性晶体中表面或交界面极化子的性质

The Properties of the Surface or Interface Polaron in Polar Crystals

不少极性晶体,电子与表面声学声子、体纵光学声子耦合弱,但与表面光学声子耦合强。本文同时考虑体纵光学声子、表面光学声子以表面声学声子的影响,研究这类极性晶体中的表面或交界面极化子的性质。采用线性组合算符和一种简单的么正变换,导出其有效哈密顿量和基态能量。

There is a weak coupling between electrons and BO SA phonons but a strong coupling between electrons and SO phonons for many polar crystals.In this paper,the properries of the surface or inter- face polarons in polar crystals,which is coupled both with SO BO and SA phonons are studied.The effective Hamiltonian and the ground state energy are derived by using a linear combination operator and a simple unitary transformation.