Non-local composite spin-lattice polarons in high temperature superconductors

TL;DR

This paper investigates non-local polaron formation in high-temperature superconductors using a new numerical method, revealing anisotropic electron-phonon interactions and their effects on magnetic order and spectral properties.

Contribution

It introduces a novel numerical approach to study non-local polaron effects in large lattices, highlighting the impact of longer-range hoppings on electron-phonon interactions.

Findings

Longer-range hoppings cause anisotropic electron-phonon interactions.

Nonlocal EPI destroys antiferromagnetic order at strong coupling.

Quasiparticle weight is strongly suppressed despite preserved polaron motion.

Abstract

The non-local nature of the polaron formation in t-t'-t"-J model is studied in large lattices up to 64 sites by developing a new numerical method. We show that the effect of longer-range hoppings t' and t" is a large anisotropy of the electron-phonon interaction (EPI) leading to a completely different influence of EPI on the nodal and antinodal points in agreement with the experiments. Furthermore, nonlocal EPI preserves polaron's quantum motion, which destroys the antiferromagnetic order effectively, even at strong coupling regime, although the quasi-particle weight in angle-resolved-photoemission spectroscopy is strongly suppressed.