Quantum Ice : a quantum Monte Carlo study
Abstract
Ice states, in which frustrated interactions lead to a macroscopic ground-state degeneracy, occur in water ice, in problems of frustrated charge order on the pyrochlore lattice, and in the family of rare-earth magnets collectively known as spin ice. Of particular interest at the moment are "quantum spin ice" materials, where large quantum fluctuations may permit tunnelling between a macroscopic number of different classical ground states. Here we use zero-temperature quantum Monte Carlo simulations to show how such tunnelling can lift the degeneracy of a spin or charge ice, stabilising a unique "quantum ice" ground state --- a quantum liquid with excitations described by the Maxwell action of 3+1-dimensional quantum electrodynamics. We further identify a competing ordered "squiggle" state, and show how both squiggle and quantum ice states might be distinguished in neutron scattering experiments on a spin ice material.
Cite
@article{arxiv.1105.4196,
title = {Quantum Ice : a quantum Monte Carlo study},
author = {Nic Shannon and Olga Sikora and Frank Pollmann and Karlo Penc and Peter Fulde},
journal= {arXiv preprint arXiv:1105.4196},
year = {2015}
}
Comments
4.5 pages, 6 eps figures - accepted for publication in Phys. Rev. Lett