Strong-coupling expansions for the attractive Holstein and Hubbard models.
Strong-coupling expansions for the attractive Holstein and Hubbard models.
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有吸引力的荷斯坦和哈伯德模型的强耦合扩展。
DOI：
10.1103/physrevb.48.3881
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发表时间：
1993
期刊：
影响因子：
--
通讯作者：
Freericks
中科院分区：
文献类型：
--
作者：
Freericks
荷斯坦（电子声子）模型的强耦合展开通过四阶进行。在大频率限制下，展开式与有吸引力的哈伯德模型的已知结果一致。采用平均场理论来确定有效（赝自旋）哈密顿量的转变温度，并将结果与最近对这些模型在无限维度上的蒙特卡罗模拟进行比较。
A strong-coupling expansion for the Holstein (electron-phonon) model is carried out through fourth order. In the large-frequency limit the expansion agrees with known results for the attractive Hubbard model. Mean-field theory is employed to determine transition temperatures of the effective (pseudospin) Hamiltonian and the results are compared with recent Monte Carlo simulations of these models in infinite dimensions.