Electronic quasiparticles in the quantum dimer model: Density matrix renormalization group results

Junhyun Lee, Subir Sachdev, and Steven R. White
Phys. Rev. B 94, 115112 – Published 7 September 2016

Abstract

We study a recently proposed quantum dimer model for the pseudogap metal state of the cuprates. The model contains bosonic dimers, representing a spin-singlet valence bond between a pair of electrons, and fermionic dimers, representing a quasiparticle with spin-1/2 and charge +e. By density matrix renormalization group calculations on a long but finite cylinder, we obtain the ground-state density distribution of the fermionic dimers for a number of different total densities. From the Friedel oscillations at open boundaries, we deduce that the Fermi surface consists of small hole pockets near (π/2,π/2), and this feature persists up to a doping density of 1/16. We also compute the entanglement entropy and find that it closely matches the sum of the entanglement entropies of a critical boson and a low density of free fermions. Our results support the existence of a fractionalized Fermi liquid in this model.

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  • Received 28 June 2016
  • Revised 14 August 2016

DOI:https://doi.org/10.1103/PhysRevB.94.115112

©2016 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Junhyun Lee

  • Department of Physics, Harvard University, Cambridge, Massachusetts 02138, USA

Subir Sachdev

  • Department of Physics, Harvard University, Cambridge, Massachusetts 02138, USA and Perimeter Institute for Theoretical Physics, Waterloo, Ontario, Canada N2L 2Y5

Steven R. White

  • Department of Physics and Astronomy, University of California, Irvine, California 92697-4575, USA

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Issue

Vol. 94, Iss. 11 — 15 September 2016

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