
VOLUME 50  ISSUE 10 
PAGE 469

The RVB model as the problem of the surface of a quantum crystal
Levitov L. S.
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.

Permission given by American Institute of Physics is appreciated.
