Volume 95, Number 4, August 2011
|Number of page(s)||6|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||01 August 2011|
Emergent spin liquids in the hubbard model on the anisotropic honeycomb lattice
Laboratoire de Physique des Solides, Univ. Paris-Sud, CNRS UMR 8502 - F-91405 Orsay, France, EU
2 Centre for Quantum Technologies, National University of Singapore - Singapore 117543, Singapore
3 Department of Physics, Faculty of Science, National University of Singapore - Singapore 117542, Singapore
4 Institut Non Linéaire de Nice, UNS, CNRS - 1361 route des Lucioles, F-06560 Valbonne, France, EU
5 Laboratoire Kastler-Brossel, UPMC-Paris 6, ENS, CNRS - 4 Place Jussieu, F-75005 Paris, France, EU
Accepted: 4 July 2011
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.
PACS: 71.30.+h – Metal-insulator transitions and other electronic transitions / 71.10.Fd – Lattice fermion models (Hubbard model, etc.) / 37.10.Jk – Atoms in optical lattices
© EPLA, 2011
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