Spectral function of the two-dimensional Hubbard model: A density matrix renormalization group plus cluster perturbation theory study

被引：23
作者：
Yang, Chun [1 ]
Feiguin, Adrian E. [1 ]
机构：
[1] Northeastern Univ, Dept Phys, Boston, MA 02115 USA
来源：
PHYSICAL REVIEW B | 2016年 / 93卷 / 08期
基金：
美国国家科学基金会;
关键词：
QUASI-PARTICLE DISPERSION; MEAN-FIELD THEORY; SELF-ENERGY; T-J; CORRELATED SYSTEMS; ELECTRON-SYSTEMS; CHARGE MODES; WEIGHT; PHASE; WEAK;
D O I：
10.1103/PhysRevB.93.081107
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
We study the spectral function of the two-dimensional Hubbard model using cluster perturbation theory, and a density matrix renormalization group as a cluster solver. We reconstruct the two-dimensional dispersion at and away from half-filling using 2 x L ladders, with L up to 80 sites, yielding results with unprecedented resolution in excellent agreement with quantum Monte Carlo. The main features of the spectrum can be described with a mean-field dispersion, with kinks and pseudogap traced back to scattering between spin and charge degrees of freedom.
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页数：5
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