Rachel, S.; Laubach, M.; Reuther, J.; Thomale, R.: Quantum paramagnet in a π flux triangular lattice Hubbard model. Physical Review Letters 114 (2015), p. 167201/1-5
10.1103/PhysRevLett.114.167201
Open Access Version (externer Anbieter)
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 numerical investigation.