Journal article
Quantum disordered insulating phase in the frustrated cubic-lattice Hubbard model
M Laubach, DG Joshi, J Reuther, R Thomale, M Vojta, S Rachel
Physical Review B | AMER PHYSICAL SOC | Published : 2016
Abstract
In the quest for quantum spin liquids in three spatial dimensions (3D), we study the half-filled Hubbard model on the simple cubic lattice with hopping processes up to third neighbors. Employing the variational cluster approach (VCA), we determine the zero-temperature phase diagram: In addition to a paramagnetic metal at small interaction strength U and various antiferromagnetic insulators at large U, we find an intermediate-U antiferromagnetic metal. Most interestingly, we also identify a nonmagnetic insulating region, extending from intermediate to strong U. Using VCA results in the large-U limit, we establish the phase diagram of the corresponding J1-J2-J3 Heisenberg model. This is qualit..
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Awarded by European Commission
Funding Acknowledgements
We acknowledge financial support by the DFG through SFB 1143 (M.L., D.G.J., M.V., S.R.) and SFB 1170 (R.T.), by the ERC through the starting grant TOPOLECTRICS (ERC-StG-Thomale-336012, R.T.), and by the Helmholtz association through the virtual institute VI-521 (M.V., S.R.). We thank the Center for Information Services and High Performance Computing (ZIH) at TU Dresden for generous allocations of computer time.