Phys. Rev. Lett. 61, 2376–2379 (1988)Superconductivity and the Quantum Hard-Core Dimer GasReceived 21 March 1988; published in the issue dated 14 November 1988 We discuss the short-range resonating-valence-bond system as realized by a quantum hard-core dimer gas of arbitrary density on a two-dimensional square lattice. When the dimers completely cover the lattice, we argue that there is a first-order transition from a dimer crystal to an insulating quantum liquid state which possesses low-energy, neutral, spinless excitations which we call "resonons." For less than close-packed densities, the ground state is a superfluid. In addition to the usual Goldstone mode, there are low-energy, spinless zone-boundary excitations. © 1988 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.61.2376
DOI:
10.1103/PhysRevLett.61.2376
PACS:
75.10.Jm
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