Charge-Density-Wave Formation in the Doped Two-Leg Extended Hubbard Ladder

Abstract

We investigate electronic properties of the doped two-leg Hubbard ladder with both the onsite and the nearest-neighbor Coulomb repulsions, by using the the weak-coupling renormalization-group method. It is shown that, for strong nearest-neighbor repulsions, the charge-density-wave state coexisting with the p-density-wave state becomes dominant fluctuation where spins form intrachain singlets. By increasing doping rate, we have also shown that the effects of the nearest-neighbor repulsions are reduced and the system exhibits a quantum phase transition into the d-wave-like (or rung-singlet) superconducting state. We derive the effective fermion theory which describes the critical properties of the transition point with the gapless excitation of magnon. The phase diagram of the two-leg ladder compound, Sr_{14-x}Ca_xCu_{24}O_{41}, is discussed.

arXiv comment4 pages, 2 figures

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Cited by in corpus (8)

• Excitation spectrum of doped two-leg ladders: A field theory analysis
• Orbital current patterns in doped two-leg Cu-O Hubbard ladders
• Anisotropic Charge Modulation in Ladder Planes of Sr_14-xCa_xCu_24O_41
• Spinful fermionic ladders at incommensurate filling: Phase diagram, local perturbations, and ionic potentials
• Orbital currents and charge density waves in a generalized Hubbard ladder
• Magnetic response and quantum critical behavior in the doped two-leg extended Hubbard ladder
• Terminable Transitions in a Topological Fermionic Ladder
• $d_{x^2-y^2}$-wave density wave and $d_{x^2-y^2}$-wave superconducting gap on the extended Hubbard model on a square lattice