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Topological states constructed by two different trivial quantum wires |
| Jing-Run Lin(林景润), Linxi Lv(吕林喜), and Zheng-Wei Zuo(左正伟)† |
| School of Physics and Engineering, Henan University of Science and Technology, Luoyang 471023, China |
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Abstract The topological states of the two-leg and three-leg ladders formed by two trivial quantum wires with different lattice constants are theoretically investigated. Firstly, we take two trivial quantum wires with a lattice constant ratio of 1:2 as an example. For the symmetric nearest-neighbor intra-chain hopping two-leg ladder, the inversion symmetry protected topological insulator phase with two degenerate topological edge states appears. When the inversion symmetry is broken, the topological insulators with one or two topological edge states of different energies and topological metals with edge states embedded in the bulk states could emerge depending on the filling factor. The topological origin of these topological states in the two-leg ladders is the topological properties of the Chern insulators and Chern metals. According to the arrangement of two trivial quantum wires, we construct two types of three-leg ladders. Each type of the three-leg ladder could be divided into one trivial subspace and one topological nontrivial subspace by unitary transformation. The topological nontrivial subspace corresponds to the effective two-leg ladder model. As the filling factor changes, the system could be in topological insulators or topological metals phases. When the two-leg ladder is constructed by two trivial quantum wires with a lattice constant ratio of 1:3 and 2:3, the system could also realize rich topological states such as the topological insulators and topological metals with the topological edge states. These rich topological states in the two-leg and three-leg ladders could be confirmed by current experimental techniques.
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Received: 11 October 2024
Revised: 31 October 2024
Accepted manuscript online: 07 November 2024
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PACS:
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03.65.Vf
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(Phases: geometric; dynamic or topological)
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73.43.-f
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(Quantum Hall effects)
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03.65.-w
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(Quantum mechanics)
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02.10.Ox
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(Combinatorics; graph theory)
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| Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 12074101 and 11604081). Z W Zuo is also sponsored by the Natural Science Foundation of Henan Province, China (Grant No. 212300410040). |
Corresponding Authors:
Zheng-Wei Zuo
E-mail: zuozw@haust.edu.cn
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Cite this article:
Jing-Run Lin(林景润), Linxi Lv(吕林喜), and Zheng-Wei Zuo(左正伟) Topological states constructed by two different trivial quantum wires 2025 Chin. Phys. B 34 010306
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