Berlin 2015 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 5: Correlated Electrons: Spin Systems and Itinerant Magnets – Frustrated Magnets 1 (jointly with MA)
TT 5.5: Vortrag
Montag, 16. März 2015, 10:30–10:45, H 0110
Quantum spin liquid in a π flux triangular lattice Hubbard model — •Stephan Rachel1, Manuel Laubach2, Johannes Reuther3, and Ronny Thomale2 — 1Technische Universität Dresden — 2Universität Würzburg — 3Dahlem Center for Complex Quantum Systems and FU Berlin
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 which we identify for intermediate Hubbard U is framed by a Dirac semi-metal 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.