paper

Critical colored-RVB states in the frustrated quantum Heisenberg model on the square lattice

arXiv:1907.03678 · doi:10.21468/SciPostPhys.7.4.041

Abstract

We consider a family of SU(2)-symmetric Projected Entangled Paired States (PEPS) on the square lattice, defining colored-Resonating Valence Bond (RVB) states, to describe the quantum disordered phase of the frustrated Heisenberg model.For we show the emergence of critical (algebraic) dimer-dimer correlations -- typical of Rokhsar-Kivelson (RK) points of quantum dimer models on bipartite lattices -- while, simultaneously, the spin-spin correlation length remains short. Our findings are consistent with a spin liquid or a weak Valence Bond Crystal in the neighborhood of an RK point.

19 pages, 8 figures, v2 minor modifications, 1 ref added

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