Motivated by the unabating interest in the spin-1/2 Heisenberg antiferromagnetic model on the Kagome lattice, we investigate the energetics of projected Schwinger boson (SB) wave functions in the J1--J2 model with antiferromagnetic J2 coupling. Our variational Monte Carlo results show that Sachdev's Q1=Q2 SB ansatz has a lower energy than the Dirac spin liquid for J2≳0.08J1 and the q=0 Jastrow type magnetically ordered state. This work demonstrates that the projected SB wave functions can be tested on the same footing as their fermionic counterparts.
@article{arxiv.1103.4429,
title = {Variational study of J1-J2 Heisenberg model on Kagome lattice using projected Schwinger boson wave functions},
author = {Tiamhock Tay and Olexei I. Motrunich},
journal= {arXiv preprint arXiv:1103.4429},
year = {2011}
}