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Z. Y. Meng (1), T. C. Lang (2), S. Wessel (1), F. F. Assaad (2), A. Muramatsu (1)
(1) Institut für Theoretische Physik III, Universität Stuttgart, Germany (2) Institut für Theoretische Physik und Astrophysik, Universität Würzburg, Germany A notable exception to the tendency of order at low temperatures is the case of quantum spin liquids, in which quantum fluctuations prevent a transition to an ordered state even at T=0. We show, by means of large-scale projective quantum Monte Carlo simulations of the half-filled Hubbard model on the honeycomb lattice, that a quantum spin liquid emerges between the state described by massless Dirac fermions and an antiferromagnetically ordered Mott insulator [1]. We discuss recent proposals on the nature of the quantum spin liquid phase in the of light of new results. [1] Z. Meng, T. Lang, S. Wessel, F. Assaad, and A. Muramatsu, Nature 464, 847 (2010). |
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