Phase diagram of hole doped two-leg Cu-O ladders

Details Phase diagram of hole doped two-leg Cu-O ladders Phase diagram of hole doped two-leg Cu-O ladders

2007-09-14

arxiv.org/abs/0709.2303v1

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 2 figures, accepted to Phys. Rev. B, Rapid Comm

Scientific paper

10.1103/PhysRevB.76.161101

In the weak coupling limit, we establish the phase diagram of a two-leg ladder with a unit cell containing both Cu and O atoms, as a function of doping. We use bosonization and design a specific RG procedure to handle the additional degrees of freedom. Significant differences are found with the single orbital case; for purely repulsive interactions, a completely massless quantum critical region is obtained at intermediate carrier concentrations (well inside the bands) where the ground state consists of an incommensurate pattern of orbital currents plus a spin density wave (SDW) structure.

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