Ferromagnetism and Antiferromagnetism of Correlated Topological Insulator with Flat Band

Details Ferromagnetism and Antiferromagnetism of Correlated Topological Insulator with Flat Band Ferromagnetism and Antiferromagnetism of Correlated Topological Insulator with Flat Band

2012-04-21

arxiv.org/abs/1204.4766v1

Physics

Condensed Matter

Strongly Correlated Electrons

11 pages, 19 figures

Scientific paper

In this paper, based on the mean field approach and random-phase-approximation, we study the magnetic properties of the spinful Haldane model on honeycomb lattice of topological flat band with on-site repulsive Coulomb interaction. We find that the antiferromagnetic (AF) order is more stable than ferromagnetic (FM) order at (or near) half-filling; while away from half-filling the phase diagram becomes complex: At large doping, FM order is more stable than AF order due to the flatness of band structure. In particular, we find that at quarter filling case, the system becomes a Q=1$ topological insulator which is induced by the FM order.

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