We investigate a superlattice alternately composed of quantum spin Hall insulators in Kane - Mele model and two-dimensional normal insulators due to the staggered lattice potential. The staggered lattice potential in normal insulators as a spacer layer has a role of breaking an inversion symmetry in current study. We show a realization of Weyl semimetal (WSM) phase in a finite region and a phase transition to a weak topological insulator. We estimate Z2 topological invariants by means of Wannier charge center method which is practical for non-centrosymmetric topological insulators. We also discuss Fermi arcs and chiral charges of WSM phase in surface Brillouin zone.
Bibliographical noteFunding Information:
This work was supported by the National Research Foundation of Korea through Grant No. 2013R1A1A2007959 and Grant No. 2018R1D1A1B07048749.
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- Wannier charge center
- Weyl semimetal
- Z topological insulator