| 一维体系的电声子相互作用和声子激发 |
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| 引用本文： | 王连涛,吴长勤.一维体系的电声子相互作用和声子激发[J].物理学报,1996,45(10):1717-1723. |
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| 作者姓名： | 王连涛 吴长勤 |
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| 作者单位： | 复旦大学物理系 |
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| 基金项目： | 上海市科学技术委员会科技启明星计划资助的课题. |
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| 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，两个模型的声子谱均无能隙
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| 关 键 词： | 电－声子 相互作用 声子激发 一维体系 晶体物理 |
| 收稿时间： | 1995-07-25 |
ELECTRON-PHONON INTERACTIONS AND PHONON EXCITATIONS IN ONE-DIMENSIONAL SYSTEMS |
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| WANG LIAN-TAO and WU CHANG-QIN.ELECTRON-PHONON INTERACTIONS AND PHONON EXCITATIONS IN ONE-DIMENSIONAL SYSTEMS[J].Acta Physica Sinica,1996,45(10):1717-1723. |
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| Authors: | WANG LIAN-TAO and WU CHANG-QIN |
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| Abstract: | Electron-phonon interactions and phonon excitations are studied on the models both for the halogen-bridged moxed-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. |
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