Evidence for valence-bond pairing in a one-dimensional two-orbital system
Strongly Correlated Electrons
2025-07-08 v2
Abstract
Valence bond (VB) states as the formation mechanism of Cooper pairs, eventually leading to high-temperature superconductivity, remain a controversial topic. Although various VB-like states find variational relevance in the description of specific spin models and quantum spin liquids, in the realm of many-body fermionic Hamiltonians, the evidence for such states as ground states wave functions remains elusive, challenging the valence-bond pairing mechanism. Here, we present evidence of a VB ground state with pairing tendencies, particularly at finite doping. We achieved this for the generic two-orbital Hubbard model in low dimension, where the VB states can be associated with the presence of the topological order manifested by edge states.
Keywords
Cite
@article{arxiv.2411.03771,
title = {Evidence for valence-bond pairing in a one-dimensional two-orbital system},
author = {M. Mierzejewski and E. Dagotto and J. Herbrych},
journal= {arXiv preprint arXiv:2411.03771},
year = {2025}
}