Role of Degeneracy, Hybridization, and Nesting in the Properties of Multi-Orbital Systems

TL;DR

This study investigates how degeneracy, hybridization, and nesting influence magnetic and pairing properties in multiorbital Hubbard models, revealing that hybridization and orbital flavor consistency are crucial for magnetic order development.

Contribution

It demonstrates that nesting alone does not guarantee magnetic order; hybridization and orbital flavor matching are essential, providing new insights into multiorbital system behavior.

Findings

Hybridized bands lead to metallic magnetic order in weak coupling.

Non-hybridized bands exhibit insulating excitonic orbital-transverse spin state.

Both models show insulating magnetic stripe order in strong coupling.

Abstract

To understand the role that degeneracy, hybridization, and nesting play in the magnetic and pairing properties of multiorbital Hubbard models we here study numerically two types of two- orbital models, both with hole-like and electron-like Fermi surfaces (FS's) that are related by nesting vectors ({\pi}, 0) and (0, {\pi}). In one case the bands that determine the FS's arise from strongly hybridized degenerate dxz and dyz orbitals, while in the other the two bands are determined by non-degenerate and non-hybridized s-like orbitals. Using a variety of techniques, in the weak coupling regime it is shown that only the model with hybridized bands develops metallic magnetic order, while the other model exhibits an ordered excitonic orbital-transverse spin state that is insulating and does not have a local magnetization. However, both models display similar insulating magnetic stripe ordering in the strong coupling limit. These results indicate that nesting is a necessary but not sufficient condition for the development of ordered states with finite local magnetization in multiorbital Hubbard systems; the additional ingredient appears to be that the nested portions of the bands need to have the same orbital flavor. This condition can be achieved via strong hybridization of the orbitals in weak coupling or via the FS reconstruction induced by the Coulomb interactions in the strong coupling regime. This effect also impacts the pairing symmetry as demonstrated by the study of the dominant pairing channels for the two models.