Journal article
Quantum paramagnet in a π flux triangular lattice Hubbard model
S Rachel, M Laubach, J Reuther, R Thomale
Physical Review Letters | AMER PHYSICAL SOC | Published : 2015
Abstract
We propose the π flux triangular lattice Hubbard model (π THM) as a prototypical setup to stabilize magnetically disordered quantum states of matter in the presence of charge fluctuations. The quantum paramagnetic domain of the π THM that we identify for intermediate Hubbard U is framed by a Dirac semimetal for weak coupling and by 120° Néel order for strong coupling. Generalizing the Klein duality from spin Hamiltonians to tight-binding models, the π THM maps to a Hubbard model which corresponds to the (JH,JK)=(-1,2) Heisenberg-Kitaev model in its strong coupling limit. The π THM provides a promising microscopic testing ground for exotic finite-U spin liquid ground states amenable to numeri..
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Awarded by National Science Foundation
Funding Acknowledgements
We thank F. F. Assaad, L. Balents, S. Bieri, M. Vojta, and S. Wessel for discussions. We are grateful to O. Motrunich for pointing out Ref. [29]. S. R. is supported by DFG-FOR 960, DFG-SPP 1666, DFG-SFB 1143, and by the Helmholtz association through VI-521. J. R. acknowledges support from the Deutsche Akademie der Naturforscher Leopoldina through Grant LPDS 2011-14. M. L. and R. T. are supported by the ERC starting Grant TOPOLECTRICS (ERC-StG-Thomale-336012) and by the National Science Foundation under Grant No. NSF PHY11-25915. We thank the Center for Information Services and High Performance Computing (ZIH) at TU Dresden for generous allocations of computer time.