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

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.

6+7 pages, 5+10 figures; updated, corrected version

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• Observation of excitons bound by antiferromagnetic correlations
• Post-experiment coincidence detection techniques for direct detection of two-body correlations
• Exploring kinetically induced bound states in triangular lattices with ultracold atoms: spectroscopic approach
• Emergent spinon-holon Feshbach resonance in a doped Majumdar-Ghosh model
• Coincidence detection techniques for direct measurement of many-body correlations in strongly correlated electron systems