物理学报2012，Vol.61Issue(12)：269-275,7.
两格点两电子Hubbard-Holstein模型极化子的量子纠缠特性
Two-site Hubbard-Holstein model polaron of quantum entanglement properties
摘要
Abstract
We obtain the exact solution of energy spectrum and dynamics for the two-site Hubbard-Holstein model by the coherent states orthogonal expansion method. The influences of coupling strength g, the average number of phonons and the initial electronic state on the evolution of system entanglement and yon Neumann entropy are discussed. Numerical results are as follows. （a） Entanglement evolution with time shows a good periodicity. When the other parameters are fixed, the evolution period decreases as the coupling strength g goes up but it is independent of the average number of phonons h. （b） The yon Neumann entropy of the system demonstrates strict synchronia with the electronic state occupancy probability. （c） Under the weak coupling strength and low average number of phonons, the initial electronic state c2＋↑c2＋↓10） or c1＋↑c1＋↓10）e shows larger maximum von Neumann entropy during its evolution than that of c1＋↑c2＋↓10）-c1＋↑c2＋↓10 ;but they gradually approach to each other with the increase of coupling strength or average number of phouons.关键词
相干态正交化展开/Hubbard．Holstein模型/极化子/场熵Key words
coherent-state orthogonalization expansion/Hubbard-Holstein model/polaron/field entropy分类
数理科学引用本文复制引用
任学藻,贺树,丛红璐,王旭文..两格点两电子Hubbard-Holstein模型极化子的量子纠缠特性[J].物理学报,2012,61(12):269-275,7.基金项目
国家自然科学基金委员会一中国工程物理研究院联合基金（批准号：10976025/A06）资助的课题. （）
