Mott-insulator to commensurate-solid transition in a 4He layer on \alpha-graphyne: Pseudo-spin symmetry breaking under a particle-induced pseudo-magnetic field
Abstract
Path-integral Monte Carlo calculations were performed to study the adsorption of He atoms on -graphyne. We find that one He atom can be embedded onto the in-plane center of each hexagon of the graphyne. In the first He layer above the He-embedded graphyne surface, a Mott insulating state was observed at the areal density of 0.0706 \AA with three He atoms occupying each hexagonal cell while the helium atoms form a commensurate triangular solid at a density of 0.0941 \AA. Here we show that the Ising pseudo-spin symmetry introduced for two degenerate configurations of three He atoms in a hexagonal cell can be broken by additional He atoms placed at the hexagon vertices and the Mott-insulator to commensurate-solid transition is a transition from a nonmagnetic spin liquid of frustrated antiferromagnets to a spin-aligned ferromagnet under a particle-induced pseudo-magnetic field.
Keywords
Cite
@article{arxiv.1308.2556,
title = {Mott-insulator to commensurate-solid transition in a 4He layer on \alpha-graphyne: Pseudo-spin symmetry breaking under a particle-induced pseudo-magnetic field},
author = {Yongkyung Kwon and Hyeondeok Shin and Hoonkyung Lee},
journal= {arXiv preprint arXiv:1308.2556},
year = {2013}
}
Comments
5 pages, 4 figures, submitted to Physical Review Letters