Spinon deconfinement in doped frustrated quantum antiferromagnets
Abstract
The confinement of a spinon liberated by doping two-dimensional frustrated quantum antiferromagnets with a non-magnetic impurity or a mobile hole is investigated. For a static vacancy, an intermediate behavior between complete deconfinement (kagome) and strong confinement (checkerboard) is identified in the J_1{-}J_2{-}J_3 model on the square lattice, with the emergence of two length scales, a spinon confinement length larger than the magnetic correlation length. For mobile holes, this translates into an extended spinon-holon boundstate allowing one to bridge momentum (ARPES spectral function) and real space (STM) experimental observations. These features provide clear evidence for a nearby "deconfined critical point" in a doped microscopic model.
Keywords
Cite
@article{arxiv.cond-mat/0506810,
title = {Spinon deconfinement in doped frustrated quantum antiferromagnets},
author = {Didier Poilblanc and Andreas Laeuchli and Matthieu Mambrini and Frederic Mila},
journal= {arXiv preprint arXiv:cond-mat/0506810},
year = {2007}
}
Comments
Revised manuscript -- Ref. 26 added