Three Body bound-states and the development of odd frequency pairing

TL;DR

This paper introduces a mean-field theory linking three-body bound states to odd-frequency superconductivity, revealing a neutral Fermi surface that may explain thermal conductivity observations in heavy fermion superconductors.

Contribution

It develops a novel mean-field framework connecting three-body bound states to odd-frequency pairing in the Kondo Lattice model, highlighting the emergence of a neutral Fermi surface.

Findings

Formation of a gapless neutral Fermi surface.

Potential explanation for isotropic thermal conductivity.

New insight into odd-frequency superconductivity mechanisms.

Abstract

We propose that the development of odd-frequency superconductivity is driven by the collective formation of neutral three body bound-states. Using a three-body bound-state ansatz we develop a mean-field theory for odd-frequency pairing within the Kondo Lattice model. Three body bound-state formation leads to the formation of a gapless band of fermions with a neutral, spinless Fermi surface. We discuss the low energy excitations of these modes, suggesting them as a possible explanation for the absence of anisotropy in the thermal conductivity of heavy fermion superconductors.