Continuous easy-plane deconfined phase transition on the kagome lattice
Abstract
We use large scale quantum Monte-Carlo simulations to study an extended Hubbard model of hardcore bosons on the kagome lattice. In the limit of strong nearest-neighbor interactions at 1/3 filling, the interplay between frustration and quantum fluctuations leads to a valence bond solid ground state. The system undergoes a quantum phase transition to a superfluid phase as the interaction strength is decreased. It is still under debate whether the transition is weakly first order or represents an unconventional continuous phase transition. We present a theory in terms of an easy-plane NCCP gauge theory describing the phase transition at 1/3 filling. Utilizing large scale quantum Monte-Carlo simulations with parallel tempering in the canonical ensemble up to 15552 spins, we provide evidence that the phase transition is continuous at exactly 1/3 filling. A careful finite size scaling analysis reveals an unconventional scaling behavior hinting at deconfined quantum criticality.
Cite
@article{arxiv.1706.05414,
title = {Continuous easy-plane deconfined phase transition on the kagome lattice},
author = {Xue-Feng Zhang and Yin-Chen He and Sebastian Eggert and Roderich Moessner and Frank Pollmann},
journal= {arXiv preprint arXiv:1706.05414},
year = {2018}
}
Comments
8 pages, 11 figures, nearly same as published version Latest version and more information at http://power.itp.ac.cn/~zxf