1211.6519 (Anthony R. Wright)
Anthony R. Wright
Chern insulators, first proposed by Haldane over 20 years ago, has not been observed experimentally. While there is some expectation that topological insulators with broken time reversal symmetry may realise the phase, the mechanism - spin orbit interaction together with magnetic exchange - has a completely different origin to Haldane's staggered magnetic field. I show that buckled lattices with in-plane magnetic fields are a promising route to realising Haldane-like models. As a concrete example, I consider silicene, a honeycomb lattice with out-of-plane sublattice anisotropy, in an in-plane magnetic field, and show that it is a Chern insulator, even at negligibly small magnetic fields, which is analogous to Haldane's original model, though bears some interesting differences as well.
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http://arxiv.org/abs/1211.6519
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