Nematic antiferromagnetism and deconfined criticality from the interplay between electron-phonon and electron-electron interactions

Article

关键词: MONTE-CARLO;    GROUND-STATES;    SPIN-PEIERLS;   

DOI  :  10.1103/PhysRevB.104.L081110

来源: SCIE

【 摘 要 】

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 O(4) symmetry between the VBS and the nematic antiferromagnetic phases.

【 授权许可】

Free