Dopant pairing in a disordered magnetic spin ladder

TL;DR

This paper reveals a dopant pairing mechanism in a disordered magnetic spin ladder, where high-temperature spin disorder causes dopants to co-propagate, with implications for quantum simulations.

Contribution

It introduces a novel pairing mechanism driven by spin disorder in a mixed-dimensional magnetic lattice model.

Findings

Dopants tend to co-propagate due to spin disorder.

Thermal spin disorder frustrates dopant motion.

Predictions are testable in quantum simulation experiments.

Abstract

I demonstrate a pairing mechanism of dopants in a magnetic lattice, emerging from the underlying high-temperature disorder of the spins. The effect is demonstrated in a mixed-dimensional model, where dopants travel along a two-leg ladder, while the spins feature Ising interactions along the rungs and the legs of the ladder. The dynamics following the sudden immersion of two nearest neighbor dopants in an infinite temperature spin lattice shows that thermal spin disorder frustrates the relative motion of the dopants and enforces them to co-propagate. The predictions are shown to be realistically testable in quantum simulation experiments.