Dynamical domain walls and spin-Peierls order in doped antiferromagnets: evidence from exact diagonalization of small clusters
Abstract
The hole-doped 2D t-J model is studied by exact diagonalization on a 5 x 4 cluster which, unlike the standard tilted square clusters, can in principle accomodate an antiphase domain wall. For hole concentration 10% and J/t >= 0.5 the ground state energy/site is lower than the conventional tilted square 20-site-cluster. In the ground state two holes form a loosely bound pair pinned to an antiphase domain wall. The dynamical density correlation function shows sharp quasiparticle-like peaks, reminiscent of the `holons' in 1D chains, which suggest the existence of soliton-like, propagating domain walls. The dynamical correlation function of the bond-singlet operator has a low-energy peak structure characteristic of columnar Spin-Peierls order, the dynamical spin correlation function shows an intense and isolated `resonance peak' near (pi,pi).
Cite
@article{arxiv.cond-mat/0304554,
title = {Dynamical domain walls and spin-Peierls order in doped antiferromagnets: evidence from exact diagonalization of small clusters},
author = {R. Eder and Y. Ohta},
journal= {arXiv preprint arXiv:cond-mat/0304554},
year = {2009}
}
Comments
4 pages with 5 eps-figures