Charge density correlations in t-J ladders investigated by the CORE method

Details Charge density correlations in t-J ladders investigated by the CORE method Charge density correlations in t-J ladders investigated by the CORE method

2002-08-16

arxiv.org/abs/cond-mat/0208337v2

Phys. Rev. B 66, 180503(R) (2002)

Physics

Condensed Matter

Strongly Correlated Electrons

Computation of Luttinger liquid parameters (charge velocity and charge correlation exponent) added

Scientific paper

10.1103/PhysRevB.66.180503

Using 4-site plaquette or rung basis decomposition, the CORE method is applied to 2-leg and 4-leg t-J ladders and cylinders. Resulting range-2 effective hamiltonians are studied numerically on periodic rings taking full advantage of the translation symmetry as well as the drastic reduction of the Hilbert space. We investigate the role of magnetic and fermionic degrees of freedom to obtain the most reliable representation of the underlying model. Spin gaps, pair binding energies and charge correlations are computed and compared to available ED and DMRG data for the full Hamiltonian. Strong evidences for short-range diagonal stripe correlations are found in periodic 4-leg t-J ladders.

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