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Bulletin of the American Physical Society

Phase diagram of half-filled $J_1-J_2$-Heisenberg Kondo lattice model on honeycomb lattice

Qimiao Si A, Pallab Goswami

Published Feb 29, 2012• 0 citations
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Ground-state phase diagram of the quantum J1−J2 model on the honeycomb lattice

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We study the ground-state phase diagram of the quantum ${J}_{1}\ensuremath{-}{J}_{2}$ model on the honeycomb lattice by means of an entangled-plaquette variational ansatz. Values of energy and relevant order parameters are computed in the range $0\ensuremath{\le}{J}_{2}/{J}_{1}\ensuremath{\le}1$. The system displays classical order for ${J}_{2}/{J}_{1}\ensuremath{\lesssim}0.2$ (N\'eel) and for ${J}_{2}/{J}_{1}\ensuremath{\gtrsim}0.4$ (collinear). In the intermediate region, the ground state is disordered. Our results show that the reduction of the half-filled Hubbard model to the model studied here does not yield accurate predictions.

arXiv:1109.3681•Physical Review B•Feb 8, 2012•94 citations
Phase diagram of half-filled J1−J2J_1-J_2J1​−J2​-Heisenberg Kondo lattice model on honeycomb lattice
We study the ground-state phase diagram of the quantum ${J}_{1}\ensuremath{-}{J}_{2}$ model on the honeycomb lattice by means of an entangled-plaquette variational ansatz. Values of energy and relevant order parameters are computed in the range $0\ensuremath{\le}{J}_{2}/{J}_{1}\ensuremath{\le}1$. The system displays classical order for ${J}_{2}/{J}_{1}\ensuremath{\lesssim}0.2$ (N\'eel) and for ${J}_{2}/{J}_{1}\ensuremath{\gtrsim}0.4$ (collinear). In the intermediate region, the ground state is disordered. Our results show that the reduction of the half-filled Hubbard model to the model studied here does not yield accurate predictions.