Variational wave functions for frustrated magnetic models
Abstract
Variational wave functions containing electronic pairing and suppressed charge fluctuations (i.e., projected BCS states) have been proposed as the paradigm for disordered magnetic systems (including spin liquids). Here we discuss the general properties of these states in one and two dimensions, and show that different quantum phases may be described with high accuracy by the same class of variational wave functions, including dimerized and magnetically ordered states. In particular, phases with magnetic order may be obtained from a straightforward generalization containing both antiferromagnetic and superconducting order parameters, as well as suitable spin Jastrow correlations. In summary, projected wave functions represent an extremely flexible tool for understanding the physics of low-dimensional magnetic systems.
Cite
@article{arxiv.0905.4854,
title = {Variational wave functions for frustrated magnetic models},
author = {Federico Becca and Luca Capriotti and Alberto Parola and Sandro Sorella},
journal= {arXiv preprint arXiv:0905.4854},
year = {2009}
}
Comments
Lecture notes for Trieste Summer School, August 2007. To appear