We study numerically a bosonic analog of the Kitaev honeycomb model, which is a minimal model for 4d4/5d4 quantum magnets with honeycomb lattice geometry. We construct its phase diagram by a combination of Landau theory analysis and quantum Monte Carlo simulations. In particular, we show that the phase boundaries between the paramagnetic state and magnetically ordered states are generically fluctuation-induced first order phase transitions. Our results are potentially applicable to Ru4+- and Ir5+-based honeycomb magnets.
@article{arxiv.2212.05434,
title = {Fluctuation-induced first order phase transitions in Kitaev-like $d^4$ honeycomb magnet},
author = {Yuchen Fan and Yuan Wan},
journal= {arXiv preprint arXiv:2212.05434},
year = {2023}
}