Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2009-07-10
Phys. Rev. B 81, 245121 (2010)
Physics
Condensed Matter
Strongly Correlated Electrons
Longer version, 7+ pages, 5 figures
Scientific paper
10.1103/PhysRevB.81.245121
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 $d_{x^2-y^2}$ 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 amongst the studied ans\"atze, a projected $f-$wave state is the most favorable.
Grover Tarun
Lee Patrick A.
Senthil T.
Trivedi Nandini
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