Emergent p-wave Kondo Coupling in Multi-Orbital Bands with Mirror Symmetry Breaking

TL;DR

This paper investigates how mirror symmetry breaking in multi-orbital bands induces a p-wave Kondo coupling, leading to nematic band structures and novel pairing symmetries in heavy fermion systems.

Contribution

It demonstrates the emergence of p-wave Kondo pairing symmetry in a multi-orbital Anderson model with symmetry breaking, revealing new nematic phases.

Findings

P-wave Kondo pairing emerges self-consistently.

Band structure becomes nematic with two-fold symmetry.

Observable in spectroscopic or transport experiments.

Abstract

We examine Kondo effect in the periodic Anderson model for which the conduction band is of multi-orbital character and subject to mirror symmetry breaking field imposed externally. Taking p-orbital-based toy model for analysis, we find the Kondo pairing symmetry of p-wave character emerges self-consistently over some regions of parameter space and filling factor even though only the on-site Kondo hybridization is assumed in the microscopic Hamiltonian. The band structure in the Kondo-hybridized phase becomes nematic, with only two-fold symmetry, due to the p-wave Kondo coupling. The reduced symmetry should be readily observable in spectroscopic or transport measurements for heavy fermion system in a multilayer environment such as successfully grown recently.