Weak Mott insulators on the triangular lattice: Possibility of a gapless nematic quantum spin liquid
Author(s)Senthil, Todadri; Grover, Tarun; Lee, Patrick A.; Trivedi, N.
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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 dx2−y2 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.
DepartmentMassachusetts Institute of Technology. Department of Physics
Physical Review B
American Physical Society
Grover, Tarun et al. “Weak Mott insulators on the triangular lattice: Possibility of a gapless nematic quantum spin liquid.” Physical Review B 81.24 (2010): 245121. © 2010 The American Physical Society.
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