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Variational study of triangular lattice spin-1/2 model with ring exchanges and spin liquid state in \kappa-(ET)_2 Cu_2 (CN)_3

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arxiv cond-mat/0412556 v1 pith:LFVJ34DL submitted 2004-12-21 cond-mat.str-el cond-mat.mtrl-sci

Olexei I. Motrunich This is my paper · ORCID
classification cond-mat.str-elcond-mat.mtrl-sci
keywords liquidspinringstatestatesantiferromagneticexchangesfermi
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We study triangular lattice spin-1/2 system with antiferromagnetic Heisenberg and ring exchanges using variational approach focusing on possible realization of spin liquid states. Trial spin liquid wave functions are obtained by Gutzwiller projection of fermionic mean field states and their energetics is compared against magnetically ordered trial states. We find that in a range of the ring exchange coupling upon destroying the antiferromagnetic order, the best such spin liquid state is essentially a Gutzwiller-projected Fermi sea state. We propose this spin liquid with spinon Fermi surface as a candidate for the nonmagnetic insulating phase observed in the organic compound \kappa-(ET)_2 Cu_2 (CN)_3, and describe some experimental consequences of this proposal.

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Cited by 2 Pith papers

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    Hyperdeterminant wavefunctions with a locality structure, plus VMPI effective theories and projective expansion, give a practical variational framework for fractional Chern insulators and quantum spin liquids.

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    cond-mat.str-el 2026-08 conditional novelty 6.0 of 10

    Chargon condensation in a triangular-lattice Dirac spin liquid produces a catalog of pair-density-wave, charge-density-wave, bond-density-wave, and current-loop orders, with uniform d+id superconductivity allowed but ...

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