Charge instabilities and topological phases in the extended Hubbard model on the honeycomb lattice with enlarged unit cell

• Tipo: Artigo em Revista Científica Internacional
• Data: 2013

Autores

Grushin, AG (Autor) Outra; Eduardo V Castro (Autor) Outra; Cortijo, A (Autor) Outra; de Juan, F (Autor) Outra; Vozmediano, MAH (Autor) Outra; Valenzuela, B (Autor) Outra

Revista

Título: Physical Review B - Condensed Matter and Materials Physics

Vol. 87

ISSN: 1098-0121

Editora: American Physical Society

Indexação

ISI Web of Knowledge - 69 Citações

Scopus - 70 Citações

Outras Informações

ID Authenticus: P-002-0E7

DOI: 10.1103/physrevb.87.085136

Abstract (EN): We study spontaneous symmetry breaking in a system of spinless fermions in the honeycomb lattice paying special emphasis to the role of an enlarged unit cell on time reversal symmetry broken phases. We use a tight-binding model with nearest-neighbor hopping t and Hubbard interaction V-1 and V-2 and extract the phase diagram as a function of electron density and interaction within a mean-field variational approach. The analysis completes the previous work done in Phys. Rev. Lett. 107, 106402 (2011) where phases with nontrivial topological properties were found with only a nearest-neighbor interaction V-1 in the absence of charge decouplings. We see that the topological phases are suppressed by the presence of metallic charge density fluctuations. The addition of next to nearest-neighbor interaction V-2 restores the topological nontrivial phases. DOI: 10.1103/PhysRevB.87.085136

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 8