Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2000-08-04
Phys. Rev. B 63, 045105 (2001)
Physics
Condensed Matter
Strongly Correlated Electrons
12 pages, 13 figures, submitted to PRB, presentation revised, new results added (metallic phase at small U and V)
Scientific paper
10.1103/PhysRevB.63.045105
We investigate the ground-state phase diagram of the quarter-filled Hubbard ladder with nearest-neighbor Coulomb repulsion V using the Density Matrix Renormalization Group technique. The ground-state is homogeneous at small V, a ``checkerboard'' charge--ordered insulator at large V and not too small on-site Coulomb repulsion U, and is phase-separated for moderate or large V and small U. The zero-temperature transition between the homogeneous and the charge-ordered phase is found to be second order. In both the homogeneous and the charge-ordered phases the existence of a spin gap mainly depends on the ratio of interchain to intrachain hopping. In the second part of the paper, we construct an effective Hamiltonian for the spin degrees of freedom in the strong-coupling charge-ordered regime which maps the system onto a frustrated spin chain. The opening of a spin gap is thus connected with spontaneous dimerization.
Huebsch Arnd
Noack Reinhard M.
Vojta Matthias
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