Multi-critical point in a diluted bilayer Heisenberg quantum antiferromagnet
Strongly Correlated Electrons
2009-11-07 v2 Disordered Systems and Neural Networks
Statistical Mechanics
Abstract
The S=1/2 Heisenberg bilayer antiferromagnet with randomly removed inter-layer dimers is studied using quantum Monte Carlo simulations. A zero-temperature multi-critical point (p*,g*) at the classical percolation density p=p* and inter-layer coupling g* approximately 0.16 is demonstrated. The quantum critical exponents of the percolating cluster are determined using finite-size scaling. It is argued that the associated finite-temperature quantum critical regime extends to zero inter-layer coupling and could be relevant for antiferromagnetic cuprates doped with non-magnetic impurities.
Keywords
Cite
@article{arxiv.cond-mat/0206355,
title = {Multi-critical point in a diluted bilayer Heisenberg quantum antiferromagnet},
author = {Anders W. Sandvik},
journal= {arXiv preprint arXiv:cond-mat/0206355},
year = {2009}
}
Comments
4 pages, 6 figures. v2: only minor changes; accepted for publication in Phys. Rev. Lett