一维体系的电声子相互作用和声子激发  

ELECTRON PHONON INTERACTIONS AND PHONON EXCITATIONS IN ONE DIMENSIONAL SYSTEMS

作　　者：王连涛[1] 吴长勤[1] 

机构地区：[1]复旦大学物理系

出　　处：《物理学报》1996年第10期1717-1723,共7页Acta Physica Sinica

基　　金：上海市科学技术委员会科技启明星计划

摘　　要：通过一维金属卤素络合物模型和一维分子晶体模型研究了一维体系的电声子相互作用和声子激发．给出了在绝热近似下重整化的声子色散关系．结果表明：（１）两个模型中电声子相互作用不同，导致前者声频声子重整化可略而后者重整化修正明显；（２）与高分子材料的ＳｕＳｃｈｒｉｅｆｅｒＨｅｅｇｅｒ模型不同。Electron phonon interactions and phonon excitations are studied on the models both for the halogen bridged mixed valence transition metal linear complexes (MX) and the molecular crystals (MC). The renormalized phonon dispersions are obtained under the adiabatic approximation. We find:(1) the electron phonon interactions are different for the two models, and then the renormalization correction on the acoustic phonons is negligible for the MX model whereas the correction is obvious for the MC model;(2) no gap exists between the two branchs of phonons for the two models, which is different with that of the Su Schrieffer Heeger model for polymers.

关 键 词：电-声子 相互作用 声子激发 一维体系 晶体物理 

分 类 号：O73[理学—晶体学]