Charge-order transition in the extended Hubbard model on a two-leg ladder

Details Charge-order transition in the extended Hubbard model on a two-leg ladder Charge-order transition in the extended Hubbard model on a two-leg ladder

1999-06-07

arxiv.org/abs/cond-mat/9906101v2

Phys. Rev. B 60, R8417 (1999)

Physics

Condensed Matter

4 pages, 5 figs, minor changes, accepted for publication in PRB RC

Scientific paper

10.1103/PhysRevB.60.R8417

We investigate the charge-order transition at zero temperature in a two-leg Hubbard ladder with additional nearest-neighbor Coulomb repulsion V using the Density Matrix Renormalization Group technique. We consider electron densities between quarter and half filling. For quarter filling and U=8t, we find evidence for a continuous phase transition between a homogeneous state at small V and a broken-symmetry state with "checkerboard" [wavevector Q=(pi,pi)] charge order at large V. This transition to a checkerboard charge-ordered state remains present at all larger fillings, but becomes discontinuous at sufficiently large filling. We discuss the influence of U/t on the transition and estimate the position of the tricritical points.

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