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Spin Hamiltonians with resonating-valence-bond ground states

Quantum dimer models exhibit quantum critical points and liquid states when the ground state is the resonating-valence bond (RVB) state. We construct SU(2)-invariant spin-1/2 Hamiltonians with the same RVB ground state. The main technical obstacle overcome is the fact that different "dimer" configurations in the spin model are not orthogonal to each other. We show that the physics depends on how dimers are related to the spins, and find a Hamiltonian that may be quantum critical.

preprint2010arXivOpen access
Jennifer CanoPaul Fendley
cond-mat.stat-mechcond-mat.str-el
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Jennifer CanoPaul Fendley

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