Weak Mott insulators on the triangular lattice: Possibility of a gapless nematic quantum spin liquid

Tarun Grover, N. Trivedi, T. Senthil, and Patrick A. Lee
Phys. Rev. B 81, 245121 – Published 18 June 2010

Abstract

We study the energetics of Gutzwiller projected BCS states of various symmetries for the triangular lattice antiferromagnet with a four-particle ring exchange using variational Monte Carlo methods. In a range of parameters the energetically favored state is found to be a projected dx2y2 paired state which breaks lattice rotational symmetry. We show that the properties of this nematic or orientationally ordered paired spin-liquid state as a function of temperature and pressure can account for many of the experiments on organic materials. We also study the ring-exchange model with ferromagnetic Heisenberg exchange and find that among the studied ansätze, a projected f-wave state is the most favorable.

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  • Received 7 March 2010

DOI:https://doi.org/10.1103/PhysRevB.81.245121

©2010 American Physical Society

Authors & Affiliations

Tarun Grover1, N. Trivedi2, T. Senthil1, and Patrick A. Lee1

  • 1Department of Physics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
  • 2Department of Physics, Ohio State University, Columbus, Ohio 43210, USA

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Issue

Vol. 81, Iss. 24 — 15 June 2010

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