Enhanced pairing in doped quantum magnets with frustrating hole motion

TL;DR

This paper demonstrates strong pairing in a doped quantum magnet model with frustrated hole motion, showing that holes can gain kinetic energy through pairing in various orbital channels, even at small exchange interactions.

Contribution

It reveals how frustration in hole motion suppresses ferromagnetism and promotes pairing, providing new insights into pairing mechanisms in quantum magnets.

Findings

Strong pairing persists at small J/t values.

Frustration suppresses Nagaoka ferromagnetism.

Holes gain kinetic energy through orbital pairing.

Abstract

Evidence for strong pairing at arbitrary small J/t is provided in a t-J model on the checkerboard lattice for the sign of hopping leading to frustration in hole motion. Destructive quantum interferences suppress Nagaoka ferromagnetism when J->0 and reduce drastically coherent hole motion in the fluctuating singlet background. It is shown that, by pairing in various orbital symmetry channels, holes can benefit from a large gain of kinetic energy.