Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2005-03-15
Phys. Rev. B 72, 075126 (2005)
Physics
Condensed Matter
Strongly Correlated Electrons
10 pages, 5 figures, Version accepted for publication in PRB
Scientific paper
10.1103/PhysRevB.72.075126
We determine the phase diagram of the half-filled two-leg ladder both at weak and strong coupling, taking into account the Cu d_{x^2-y^2} and the O p_x and p_y orbitals. At weak coupling, renormalization group flows are interpreted with the use of bosonization. Two different models with and without outer oxygen orbitals are examined. For physical parameters, and in the absence of the outer oxygen orbitals, the D-Mott phase arises; a dimerized phase appears when the outer oxygen atoms are included. We show that the circulating current phase that preserves translational symmetry does not appear at weak coupling. In the opposite strong-coupling atomic limit the model is purely electrostatic and the ground states may be found by simple energy minimization. The phase diagram so obtained is compared to the weak-coupling one.
Fjaerestad John Ove
Lee Seongsu
Marston J. . B.
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