Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2005-02-23
Phys. Rev. B 73, 165114 (2006)
Physics
Condensed Matter
Strongly Correlated Electrons
6 pages, 6 figures
Scientific paper
10.1103/PhysRevB.73.165114
We study the evolution of a Mott-Hubbard insulator into a correlated metal upon doping in the two-dimensional Hubbard model using the Cellular Dynamical Mean Field Theory. Short-range spin correlations create two additional bands apart from the familiar Hubbard bands in the spectral function. Even a tiny doping into this insulator causes a jump of the Fermi energy to one of these additional bands and an immediate momentum dependent suppression of the spectral weight at this Fermi energy. The pseudogap is closely tied to the existence of these bands. This suggests a strong-coupling mechanism that arises from short-range spin correlations and large scattering rates for the pseudogap phenomenon seen in several cuprates.
Civelli Marcello
Kancharla S. S.
Kotliar Gabriel
Kyung Bumsoo
Sénéchal David
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