Topological Mott Insulators

Details Topological Mott Insulators Topological Mott Insulators

2007-09-29

arxiv.org/abs/0710.0030v1

Phys.Rev.Lett. 100, 156401 (2008)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

5 Pages, 4 figures

Scientific paper

10.1103/PhysRevLett.100.156401

We consider extended Hubbard models with repulsive interactions on a Honeycomb lattice and the transitions from the semi-metal phase at half-filling to Mott insulating phases. In particular, due to the frustrating nature of the second-neighbor repulsive interactions, topological Mott phases displaying the quantum Hall and the quantum spin Hall effects are found for spinless and spinful fermion models, respectively. We present the mean-field phase diagram and consider the effects of fluctuations within the random phase approximation (RPA). Functional renormalization group analysis also show that these states can be favored over the topologically trivial Mott insulating states.

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