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

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

2003-11-24

arxiv.org/abs/cond-mat/0311534v2

J. Phys. Soc. Jpn. 73, 804 (2004)

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 2 figures

Scientific paper

10.1143/JPSJ.73.804

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.

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