Quantum phase diagram of spin- Heisenberg model on the square lattice: an infinite projected entangled-pair state and density matrix renormalization group study
arXiv:1802.00874 · doi:10.1103/PhysRevB.97.184436
Abstract
We study the spin- Heisenberg model on the square lattice with the antiferromagnetic nearest-neighbor and the next-nearest-neighbor couplings by using the infinite projected entangled-pair state (iPEPS) ansatz and density matrix renormalization group (DMRG) calculation. The iPEPS simulation, which studies the model directly in the thermodynamic limit, finds a crossing of the ground state from the Néel magnetic state to the stripe magnetic state at , showing a direct phase transition. In the finite-size DMRG calculation on the cylinder geometry up to the cylinder width , we find a very small intermediate regime between the two magnetic order phases, which may imply the absent intermediate phase. Both calculations identify that the stripe order comes with a first-order transition at . Our results indicate that unlike the spin- square model, quantum fluctuations in the spin- model may be not strong enough to stabilize an intermediate non-magnetic phase.
arXiv comment8 pages, 7 figures
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