Phase diagram of spin-1/2 J1-J2 Heisenberg model on honeycomb lattice

Abstract

We use density matrix renormalization group (DMRG) algorithm to study the phase diagram of the spin-1/2 Heisenberg model on honeycomb lattice with first (J1) and second (J2) neighbor antiferromagnetic interactions, where a Z2 spin liquid region has been proposed. By implementing SU(2) symmetry in the DMRG code, we are able to obtain accurate results for long cylinders with width slightly over 15 lattice spacings and torus up to the size N=2*6*6. With increasing J2, we find a Neel phase with vanishing spin gap and a plaquette valence-bond (PVB) phase with non-zero spin gap. By extrapolating the square of the staggered magnetic moment ms^2 on finite-size cylinders to thermodynamic limit, we find the Neel order vanishing at J2/J1~0.22. For 0.25<J2/J1<0.35, we find a possible PVB order, which shows a fast growing PVB decay length with increasing system width. For 0.22<J2/J1<0.25, both spin and dimer orders are weak for all systems we have studied, which is consistent with a possible spin liquid phase or a deconfined quantum critical point. We present calculations of the topological entanglement entropy, compare the DMRG results with the variational Monte Carlo, and discuss possible scenarios in the thermodynamic limit for this region.

14 pages, 16 figures, 2 tables

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