Instabilities of quadratic band crossing points

Details Instabilities of quadratic band crossing points Instabilities of quadratic band crossing points

2011-05-10

arxiv.org/abs/1105.1989v2

Phys. Rev. B 84, 205122 (2011)

Physics

Condensed Matter

Strongly Correlated Electrons

9 pages, 6 figures; additional information on the fRG method (section 3) and minor changes

Scientific paper

10.1103/PhysRevB.84.205122

Using a functional renormalization group approach, we study interaction-driven instabilities in quadratic band crossing point two-orbital models in two dimensions, extending a previous study of Sun et al. [1]. The wavevector-dependence of the Bloch eigenvectors of the free Hamiltonian causes interesting instabilities toward spin nematic, quantum anomalous Hall and quantum spin Hall states. In contrast with other known examples of interaction-driven topological insulators, in the system studied here, the QSH state occurs at arbitrarily small interaction strength and for rather simple intra- and inter-orbital repulsions.

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