Fractionalized Metal in a Falicov-Kimball Model

Martin Hohenadler and Fakher F. Assaad
Phys. Rev. Lett. 121, 086601 – Published 21 August 2018
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Abstract

Quantum Monte Carlo simulations reveal an exotic metallic phase with a single-particle gap but gapless spin and charge excitations and a nonsaturating resistivity in a two-dimensional SU(2) Falicov-Kimball model. An exact duality between this model and an unconstrained slave-spin theory leads to a classification of the phase as a fractionalized or orthogonal metal whose low-energy excitations have different quantum numbers than the original electrons. Whereas the fractionalized metal corresponds to the regime of disordered slave spins, the regime of ordered slave spins is a Fermi liquid. At a critical temperature, an Ising phase transition to a spontaneously generated constrained slave-spin theory of the Hubbard model is observed.

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  • Received 24 April 2018

DOI:https://doi.org/10.1103/PhysRevLett.121.086601

© 2018 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Martin Hohenadler and Fakher F. Assaad

  • Institut für Theoretische Physik und Astrophysik, Universität Würzburg, 97074 Würzburg, Germany

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Issue

Vol. 121, Iss. 8 — 24 August 2018

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