Variational study of triangular lattice spin-1/2 model with ring exchanges and spin liquid state in kappa-(ET)2Cu2(CN)3
By O. Motrunich. 2004
267 citations recorded by the source corpus.
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 a spinon Fermi surface as a candidate for the nonmagnetic insulating phase observed in the organic compound kappa-(ET)2Cu2(CN)3, and describe some experimental consequences of this proposal.
Subfields: Condensed Matter Physics, Electronic, Optical and Magnetic Materials
View Paper: https://www.semanticscholar.org/paper/d576b23775c4724d7bb121acab0c88a2b9e53b16
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In Condensed Matter Physics
In Electronic, Optical and Magnetic Materials
Citations in the corpus
- Quantum spin liquid states (2016, methodology): “By comparing the trial energies of the AF-ordered 22 states proposed by Huse and Elser (Huse and Elser, 1988) with those of various fermionic spin liquid states, Motrunich found that the ring-exchange term favors a spin liquid ground state over the AFM-ordered state (Motrunich, 2005).”
- Quantum frustration in organic Mott insulators: from spin liquids to unconventional superconductors (2010, methodology): “A weak-coupling renormalisation group analysis has been performed on the zig-zag ladder with longer-range Coulomb repulsion (Lai and Motrunich, 2010).”