Topological Weyl Semi-metal from a Lattice Model

Details Topological Weyl Semi-metal from a Lattice Model Topological Weyl Semi-metal from a Lattice Model

2012-02-15

arxiv.org/abs/1202.3459v2

EPL 97 (2012) 67004

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

Accepted version for publication in EPL. 6 pages, 4 figures

Scientific paper

10.1209/0295-5075/97/67004

We define and study a three dimensional lattice model which displays a Weyl semi-metallic phase. This model consists of coupled layers of quantum (anomalous) Hall insulators. The Weyl semi-metallic phase appears between a resulting quantum Hall insulating phase and a normal insulating phase. Weyl fermions in this Weyl semi-metal, similar to Dirac fermions in graphene, have their lattice pseudo-spin locked to their momenta. We investigate surface states and Fermi arcs, and their evolution for different phases, by exactly diagonalizing the lattice model as well as by analyzing their topological origins.

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