Charge instabilities and topological phases in the extended Hubbard model on the honeycomb lattice with enlarged unit cell. Grushin, A. G., Castro, E. V., Cortijo, A., De Juan, F., Vozmediano, M. A., & Valenzuela, B. Physical Review B - Condensed Matter and Materials Physics, 87(8):85136, February, 2013. arXiv: 1212.6836
Charge instabilities and topological phases in the extended Hubbard model on the honeycomb lattice with enlarged unit cell [link]Paper  doi  bibtex   

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