The author studies the effect of lattice anharmonicity on theground state of the strongly correlated electron-phonon coupled systems in one dimension. It is shown shalls how that when the lattice anharmonicity is taken into account, the phonons will soften, and the squeezed state of the phonon subsystem is favorable for the electron subsystem in energy.%研究了晶格非简谐效应对一维强关联电子—声子相互作用系统基态的影响.证明考虑到晶格非简谐效应后,声子将会软化,声子子系统的压缩态对于电子子系统(极化子系统)来说在能量上是有利的.
展开▼