Doping and temperature evolution of pseudogap and spin-spin correlations in the two-dimensional Hubbard model
Doping and temperature evolution of pseudogap and spin-spin correlations in the two-dimensional Hubbard model
复制标题
DOI：
10.1103/physrevb.101.115141
复制
发表时间：
2020-01
影响因子：
3.7
通讯作者：
V. Kuz’min;M. Visotin;S. Nikolaev;S. Ovchinnikov
中科院分区：
文献类型：
--
作者：
V. Kuz’min;M. Visotin;S. Nikolaev;S. Ovchinnikov
将团簇微扰理论应用于二维Hubbard $t-t '-t''-U$模型，得到了4 × 4$和12格团簇的掺杂和温度依赖的电子光谱函数.结果表明，赝能隙和电子色散与掺杂和温度的演变是相似的，在这两种情况下，它是显着影响自旋-自旋短程相关。当短程磁序被掺杂或温度削弱，Hubbard-Ⅰ型电子色散变得更加明显时，费米弧变为大费米面，赝能隙闭合。它演示了静态自旋相关性如何影响整体色散的形状，以及如何占动态贡献导致动量依赖的光谱重量在费米表面和加宽效应。
Cluster perturbation theory is applied to the two-dimensional Hubbard $t-t'-t''-U$ model to obtain doping and temperature dependent electronic spectral function with $4 \times 4$ and 12-site clusters. It is shown that evolution of the pseudogap and electronic dispersion with doping and temperature is similar and in both cases it is significantly influenced by spin-spin short-range correlations. When short-range magnetic order is weakened by doping or temperature and Hubbard-I like electronic dispersion becomes more pronounced, the Fermi arc turns into large Fermi surface and the pseudogap closes. It is demonstrated how static spin correlations impact the overall dispersion's shape and how accounting for dynamic contributions leads to momentum-dependent spectral weight at the Fermi surface and broadening effects.