Evolution of the Spin Gap Upon Doping a 2-Leg Ladder
Condensed Matter
2009-10-31 v1
Abstract
The evolution of the spin gap of a 2-leg ladder upon doping depends upon the nature of the lowest triplet excitations in a ladder with two holes. Here we study this evolution using various numerical techniques for a t-t'-J ladder as the next-near-neighbor hopping t' is varied. We find that depending on the value of t', the spin gap can evolve continuously or discontinuously and the lowest triplet state can correspond to a magnon, a bound magnon-hole-pair, or two separate quasi-particles. Previous experimental results on the superconducting two-leg ladder Sr12Ca2Cu24O41 are discussed.
Keywords
Cite
@article{arxiv.cond-mat/0005403,
title = {Evolution of the Spin Gap Upon Doping a 2-Leg Ladder},
author = {D. Poilblanc and O. Chiappa and J. Riera and S. R. White and D. J. Scalapino},
journal= {arXiv preprint arXiv:cond-mat/0005403},
year = {2009}
}
Comments
4 pages, latex, submitted to PRL