Rachel Stephan, Laubach Manuel, Reuther Johannes, Thomale Ronny
Institute for Theoretical Physics, Technische Universität Dresden, 01062 Dresden, Germany.
Institute for Theoretical Physics, University of Würzburg, 97074 Würzburg, Germany.
Phys Rev Lett. 2015 Apr 24;114(16):167201. doi: 10.1103/PhysRevLett.114.167201. Epub 2015 Apr 23.
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 (J_{H},J_{K})=(-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 numerical investigation.
