Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2005-10-10
Phys. Rev. B 72, 205121 (2005)
Physics
Condensed Matter
Strongly Correlated Electrons
13 pages, 8 figures
Scientific paper
10.1103/PhysRevB.72.205121
The electronic states of the two-dimensional Hubbard model are investigated by means of a 4-pole approximation within the Composite Operator Method. In addition to the conventional Hubbard operators, we consider other two operators which come from the hierarchy of the equations of motion and carry information regarding nearest-neighbor spin and charge configurations. By means of this operatorial basis, we can study the physics related to the energy scale of J=4t^2/U in addition to the one of U. Present results show relevant physical features, well beyond those previously obtained by means of a 2-pole approximation, such as a four-band structure with shadow bands and a quasi-particle peak at the Fermi level. The Fermi level stays pinned to the band flatness located at (pi,0)-point within a wide range of hole-doping (0 <= delta <= 0.15). A comprehensive analysis of double occupancy, internal energy, specific heat and entropy features have been also performed. All reported results are in excellent agreement with the data of numerical simulations.
Avella Adolfo
Mancini Ferdinando
Odashima Satoru
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