Topological Weyl semi-metal from a lattice model
Département de Physique Théorique, Université de Genève - CH-1211 Genève, Switzerland
2 CNRS - Laboratoire de Physique, Ecole Normale Supérieure de Lyon - 46, Allée d'Italie, F-69007 Lyon, France, EU
Accepted: 28 February 2012
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.
PACS: 73.43.Nq – Quantum phase transitions / 73.20.At – Surface states, band structure, electron density of states / 73.21.Ac – Multilayers
© EPLA, 2012