- Letter
Nematic antiferromagnetism and deconfined criticality from the interplay between electron-phonon and electron-electron interactions
Phys. Rev. B 104, L081110 – Published 18 August, 2021
DOI: https://doi.org/10.1103/PhysRevB.104.L081110
Abstract
Systems with strong electron-phonon couplings typically exhibit various forms of charge order, while strong electron-electron interactions lead to magnetism. We use determinant quantum Monte Carlo calculations to solve a model on a square lattice with a caricature of these interactions. In the limit where electron-electron interactions dominate it has antiferromagnetic order, while where electron-phonon coupling dominates there is columnar valence-bond-solid (VBS) order. We find an intervening phase that hosts coexisting nematic and antiferromagnetic orders. We have also found evidence of a Landau-forbidden continuous quantum phase transition with an emergent symmetry between the VBS and the nematic antiferromagnetic phases.
