Electron spectral functions in a quantum dimer model for topological metals

Abstract

We study single electron spectral functions in a quantum dimer model introduced by Punk, Allais and Sachdev (Ref. [1]). The Hilbert space of this model is spanned by hard-core coverings of the square lattice with two types of dimers: ordinary bosonic spin-singlets, as well as fermionic dimers carrying charge +e and spin 1/2, which can be viewed as bound-states of spinons and holons in a doped resonating valence bond (RVB) liquid. This model realizes a metallic phase with topological order and captures several properties of the pseudogap phase in hole-doped cuprates, such as a reconstructed Fermi surface with small hole-pockets and a highly anisotropic quasiparticle residue in the absence of any broken symmetries. Using a combination of exact diagonalization and analytical methods we compute electron spectral functions and show that this model indeed exhibits a sizeable antinodal pseudogap, with a momentum dependence deviating from a simple d-wave form, in accordance with experiments on underdoped cuprates.

13 pages, 7 figures

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Cited by in corpus (7)

• Topological order, emergent gauge fields, and Fermi surface reconstruction
• Exact solution of a two-species quantum dimer model for pseudogap metals
• A slave boson description of pseudogap metals in t-J models
• Bond particle theory for the pseudogap phase of underdoped cuprates
• Signatures of correlated magnetic phases in the local two-particle density matrix
• Solvable lattice models for metals with Z2 topological order
• Quantum oscillations and criticality in a fermionic and bosonic dimer model for the cuprates