From local to nonlocal Fermi liquid in doped antiferromagnets

TL;DR

This paper investigates how the electronic properties of doped antiferromagnets evolve from local to nonlocal Fermi liquid behavior as doping levels change, highlighting the role of short-range magnetic correlations.

Contribution

It demonstrates the transition from local to nonlocal self energies in the t-J model with doping, linking nonlocality to pseudogap formation and magnetic correlations.

Findings

Self energies shift from local to nonlocal with doping.

Nonlocality is associated with pseudogap emergence.

Short-range antiferromagnetic correlations drive the nonlocal behavior.

Abstract

The variation of single-particle spectral functions with doping is studied numerically within the t-J model. It is shown that corresponding self energies change from local ones at the intermediate doping to strongly nonlocal ones for a weakly doped antiferromagnet. The nonlocality shows up most clearly in the pseudogap emerging in the density of states, due to the onset of short-range antiferromagnetic correlations.