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VOLUME 50 (1989) | ISSUE 10 | PAGE 434
The RVB model as the problem of the surface of a quantum crystal
The dimer RVB model is equivalent to the problem of the surface of a quantum crystal. There are regions on the phase diagram which correspond to a disordered state of the dimers (a quantum liquid) and to an ordered state (a crystal). In the first case, the excitations are gapless, while in the second there is a finite gap.