Paired chiral spin liquid with a Fermi surface in S=1 model on the triangular lattice

Samuel Bieri, Maksym Serbyn, T. Senthil, and Patrick A. Lee
Phys. Rev. B 86, 224409 – Published 13 December 2012

Abstract

Motivated by recent experiments on Ba3NiSb2O9, we investigate possible quantum spin liquid ground states for spin S=1 Heisenberg models on the triangular lattice. We use variational Monte Carlo techniques to calculate the energies of microscopic spin liquid wave functions where spin is represented by three flavors of fermionic spinon operators. These energies are compared with the energies of various competing three-sublattice ordered states. Our approach shows that the antiferromagnetic Heisenberg model with biquadratic term and single-ion anisotropy does not have a low-temperature spin liquid phase. However, for an SU(3)-invariant model with sufficiently strong ring-exchange terms, we find a paired chiral quantum spin liquid with a Fermi surface of deconfined spinons that is stable against all types of ordering patterns we considered. We discuss the physics of this exotic spin liquid state in relation to the recent experiment and suggest new ways to test this scenario.

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  • Received 21 August 2012

DOI:https://doi.org/10.1103/PhysRevB.86.224409

©2012 American Physical Society

Authors & Affiliations

Samuel Bieri, Maksym Serbyn, T. Senthil, and Patrick A. Lee

  • Department of Physics, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, USA

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Issue

Vol. 86, Iss. 22 — 1 December 2012

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