Doped two-leg ladder with ring exchange
Strongly Correlated Electrons
2007-05-23 v2
Abstract
The effect of a ring exchange on doped two-leg ladders is investigated combining exact diagonalization (ED) and density matrix renormalization group (DMRG) computations. We focus on the nature and weights of the low energy magnetic excitations and on superconducting pairing. The stability with respect to this cyclic term of a remarkable resonant mode originating from a hole pair-magnon bound state is examined. We also find that, near the zero-doping critical point separating rung-singlet and dimerized phases, doping reopens a spin gap.
Cite
@article{arxiv.cond-mat/0504027,
title = {Doped two-leg ladder with ring exchange},
author = {G. Roux and S. R. White and S. Capponi and A. Laeuchli and D. Poilblanc},
journal= {arXiv preprint arXiv:cond-mat/0504027},
year = {2007}
}
Comments
5 pages, 7 figures, to appear in PRB