Tuesday, August 6, 2013

1308.0738 (Ioannis Rousochatzakis et al.)

Quantum dimer model for the spin-1/2 kagome Z2 spin liquid    [PDF]

Ioannis Rousochatzakis, Yuan Wan, Frédéric Mila, Oleg Tchernyshyov
We revisit the old problem of the spin-1/2 Heisenberg antiferromagnet on kagome, a major candidate for a quantum spin liquid, focusing on the renormalization of nearest-neighbor valence-bond (NNVB) tunneling amplitudes by long-range singlet fluctuations outside the NNVB basis. We find that such virtual singlets have a dramatic influence on the dominant quantum dimer model (QDM) parameters, leading to qualitatively different physics within the NNVB framework. Based on recent numerical studies on the unconstrained QDM, the renormalized parameters favor a Z2 spin liquid, thus providing a plausible way to reconcile the NNVB description with density matrix renormalization group (DMRG) studies.
View original: http://arxiv.org/abs/1308.0738

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