iPEPS study of spin symmetry in the doped $t$-$J$ model
Abstract
We study the two-dimensional - model on a square lattice using infinite projected entangled pair states (iPEPS). At small doping, multiple orders, such as antiferromagnetic order, stripe order and superconducting order, are intertwined or compete with each other. We demonstrate the role of spin symmetry at small doping by either imposing SU(2) spin symmetry or its U(1) subgroup in the iPEPS ansatz, thereby excluding or allowing spontaneous spin-symmetry breaking respectively in the thermodynamic limit. From a detailed comparison of our simulations, we provide evidence that stripe order is pinned by long-range antiferromagnetic order. We also find that SU(2) iPEPS, which enforces a spin-singlet state, yields a uniform charge distribution and favors d-wave singlet pairing.
Keywords
Cite
@article{arxiv.2006.08323,
title = {iPEPS study of spin symmetry in the doped $t$-$J$ model},
author = {Jheng-Wei Li and Benedikt Bruognolo and Andreas Weichselbaum and Jan von Delft},
journal= {arXiv preprint arXiv:2006.08323},
year = {2021}
}