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Topological phase transition between a normal insulator and a topological metal state in a quasi-one-dimensional
Milad Jangjan1, Mir Vahid Hosseini2
1Department of Physics, Faculty of Science, University of Zanjan, Zanjan, 45371-38791, Iran.
Abstract:
We theoretically report the finding of a new kind of topological phase transition between a normal insulator and a topological metal state where the closing-reopening of bandgap is accompanied by passing the Fermi level through an additional band. The resulting nontrivial topological metal phase is characterized by stable zero-energy localized edge states that exist within the full gapless bulk states. Such states living on a quasi-one-dimensional system with three sublattices per unit cell are protected by hidden inversion symmetry. While other required symmetries such as chiral, particle-hole, or full inversion symmetry are absent in the system.
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