Current-current correlations in a CuO_3 model system

Abstract

We study a 3-band extended Hubbard model on a CuO_3 system by the density matrix renormalization group (DMRG) method. Our system has geometry similar to that of a section of the CuO_2 plane of the copper-oxide superconductors. We have studied the effects of nearest-neighbour repulsions on the current-current correlations of two model CuO_3 systems. We show that repulsive interactions are clearly capable of increasing the magnitude of the current-current correlations in both models studied. The long-distance behavior of the current-current correlations is qualitatively influenced by V. We show that repulsive interactions are capable of enhancing correlations involving at least one copper-oxygen rung over distances comparable to the length of the system. In some cases, V decreases the exponent corresponding to the power-law decay, leading to a considerable slowing down of the long-distance decay of the current-current correlations, compared to that of the Hubbard model.

11 pages, 10 figures

References in corpus (3)

• Staggered orbital currents in the half-filled two-leg ladder
• Rung-Rung Current Correlations on a 2-Leg t-J Ladder
• Nearest-neighbour Attraction Stabilizes Staggered Currents in the 2D Hubbard Model

Cited by in corpus (5)

• New Trends in Density Matrix Renormalization
• Numerical analysis of three-band models for CuO planes as candidates for a spontaneous T violating orbital current phase
• Orbital current patterns in doped two-leg Cu-O Hubbard ladders
• Phase diagram of hole doped two-leg Cu-O ladders
• Phase diagram of the three band half-filled Cu-O two-leg ladder