Matthieu Bellec, Ulrich Kuhl, Gilles Montambaux, Fabrice Mortessagne
By means of a microwave tight-binding analogue experiment of a graphene-like lattice, we observe a topological transition between a phase with a point-like band gap characteristic of massless Dirac fermions and a gapped phase. By applying a controlled anisotropy on the structure, we investigate the transition directly via density of states measurements. The wave function associated to each eigenvalue is mapped and reveals new states at the Dirac point, localized on the armchair edges. We find that with increasing anisotropy, they are more and more localized at the edges.
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http://arxiv.org/abs/1210.4642
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