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Emergent Spin Liquids in the Hubbard Model on the Anisotropic Honeycomb Lattice

We study the repulsive Hubbard model on an anisotropic honeycomb lattice within a mean-field and a slave-rotor treatment. In addition to the known semi-metallic and band-insulating phases, obtained for very weak interactions, and the anti-ferromagnetic phase at large couplings, various insulating spin-liquid phases develop at intermediate couplings. Whereas some of these spin liquids have gapless spinon excitations, a gapped one occupies a large region of the phase diagram and becomes the predominant phase for large hopping anisotropies. This phase can be understood in terms of weakly-coupled strongly dimerized states.

preprint2011arXivOpen access
Guangquan WangMark O. GoerbigChristian MiniaturaBenoit Gremaud
cond-mat.mes-hallcond-mat.str-elcond-mat.quant-gas
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Guangquan WangMark O. GoerbigChristian MiniaturaBenoit Gremaud

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