Publication: Quantum dimer model for the pseudogap metal
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Date
2015
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Proceedings of the National Academy of Sciences
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Punk, Matthias, Andrea Allais, and Subir Sachdev. 2015. “Quantum Dimer Model for the Pseudogap Metal.” Proc Natl Acad Sci USA 112 (31) (July 20): 9552–9557. doi:10.1073/pnas.1512206112.
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=1/2S=1/2, charge +e+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 8×88×8, shows anisotropic quasiparticle residue around the pocket Fermi surfaces. We discuss the relationship to experiments.
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Keywords
spin liquid, Fermi liquid, superconductivity, dimer model
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