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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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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 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.
Date issued
2010-06
URI
http://hdl.handle.net/1721.1/60860
Department
Massachusetts Institute of Technology. Department of Physics
Journal
Physical Review B
Publisher
American Physical Society
Citation
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.
Version: Final published version
ISSN
1098-0121
1550-235X

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