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Gapless spin liquid in the frustrated square lattice Heisenberg quantum antiferromagnet
by - 29 September 2013
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We construct a class of projected entangled pair states (PEPS) which is exactly the resonating valence bond (RVB) wavefunctions endowed with both short range and long range valence bonds, and with an energetically preferred RVB pattern. Taking a cylindrical geometry, we are able to construct four topological sectors with even or odd number of fluxes penetrating the cylinder and even or odd number of spinons on the boundary. The energy splitting in different topological sectors is exponentially small with the cylinder perimeter. We find a power law decay of the dimer correlation function on a torus, and a lnL correction to the entanglement entropy, indicating a gapless spin liquid phase at the optimum parameter.
Postscript :
Reference: "Constructing gapless spin liquid state for the spin-1/2 J1-J2 Heisenberg model on a square lattice", Ling Wang, Didier Poilblanc, Zheng-Cheng Gu, Xiao-Gang Wen, Frank Verstraete, Phys. Rev. Lett. 111, 037202 (2013).
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