Dichotomy of heavy and light pairs of holes in the $t-J$ model

TL;DR

This study uses advanced numerical methods to distinguish two types of charge carrier pairs in quantum antiferromagnets, revealing their internal structure, dynamical properties, and dependence on the model's parameters, which advances understanding of pairing mechanisms in unconventional superconductors.

Contribution

It identifies and characterizes two qualitatively different bound states of charge carriers in the $t-J$ model, providing new insights into their mobility and underlying pairing mechanisms.

Findings

Identified a highly mobile, meta-stable pair with dispersion proportional to $t$.

Discovered a heavy pair that moves only via spin exchange processes.

Showed the flat band behavior of heavy pairs in the Ising limit.

Abstract

A key step in unraveling the mysteries of materials exhibiting unconventional superconductivity is to understand the underlying pairing mechanism. While it is widely agreed upon that the pairing glue in many of these systems originates from antiferromagnetic spin correlations, a microscopic description of pairs of charge carriers remains lacking. Here we use state-of-the art numerical methods to probe the internal structure and dynamical properties of pairs of charge carriers in quantum antiferromagnets in four-legged cylinders. Exploiting the full momentum resolution in our simulations, we are able to distinguish two qualitatively different types of bound states: a highly mobile, meta-stable pair, which has a dispersion proportional to the hole hopping $t$, and a heavy pair, which can only move due to spin exchange processes and turns into a flat band in the Ising limit of the model. Understanding the pairing mechanism can on the one hand pave the way to boosting binding energies in related models, and on the other hand enable insights into the intricate competition of various phases of matter in strongly correlated electron systems.