A quantum dimer model for the pseudogap metal

TL;DR

This paper introduces a quantum dimer model for the pseudogap metal in hole-doped cuprates, capturing fractionalization and small Fermi surfaces consistent with experimental observations.

Contribution

It presents a novel quantum dimer framework incorporating fermionic and bosonic dimers to model the pseudogap phase without symmetry breaking.

Findings

Realizes a fractionalized Fermi liquid state.

Shows small hole pocket Fermi surfaces with area proportional to doping.

Demonstrates anisotropic quasiparticle residue around Fermi pockets.

Abstract

We propose a quantum dimer model for the metallic state of the hole-doped cuprates at low hole density, $p$. The Hilbert space is spanned by spinless, neutral, bosonic dimers and spin $S=1/2$, charge $+e$ fermionic dimers. The model realizes a `fractionalized Fermi liquid' with no symmetry-breaking and small hole pocket Fermi surfaces enclosing a total area determined by $p$. Exact diagonalization, on lattices of sizes up to $8 \times 8$, shows anisotropic quasiparticle residue around the pocket Fermi surfaces. We discuss the relationship to experiments.