期刊
PHYSICAL REVIEW B
卷 78, 期 21, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.78.212504
关键词
Hubbard model; kink bands; optical conductivity; strongly correlated electron systems
资金
- NSF [DMR0605769, PHY05-051164]
We compute the one-particle spectral function and the optical conductivity for the two-dimensional Hubbard model on a square lattice. The computational method is cellular dynamical mean-field theory in which a four-site Hubbard plaquette is embedded in a self-consistent bath. We obtain a kink feature in the dispersion of the spectral function and a mid-infrared (mid-IR) absorption peak in the optical conductivity, consistent with experimental data. Of the 256 plaquette states, only a single state which has d(x)(2)-y(2) symmetry contributes to the mid-IR, thereby suggesting a direct link with the pseudogap. Local correlations between doubly and singly occupied sites which lower the kinetic energy of a hole are the efficient cause of this effect.
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