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Abstract We investigate the topological properties of twisted bilayer superconductors with different even-parity pairings in each layer. In the presence of spin-orbit coupling, the Hamiltonian is mapped into an effective odd-parity superconductor. Based on this, we deduce the topological properties by examining the relative configuration between Fermi surface and Dirac pairing node. We show that mixed Rashba and Dresselhaus spin-orbit coupling and anisotropic hopping terms, which break the C4 symmetry of the Fermi surface, can induce first-order topological superconductors with non-zero bulk Chern number. This provides a versatile way to control the topological phases of bilayer superconductors by adjusting the twisted angle and chemical potential. We demonstrate our results using a typical twisted angle of 53.13°, at which the translation symmetry is restored and the Chern number and edge state are calculated using the Moiré momentum.
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Received: 02 April 2023
Revised: 10 May 2023
Accepted manuscript online: 10 May 2023
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PACS:
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74.78.Fk
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(Multilayers, superlattices, heterostructures)
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03.65.Vf
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(Phases: geometric; dynamic or topological)
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71.70.Ej
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(Spin-orbit coupling, Zeeman and Stark splitting, Jahn-Teller effect)
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71.10.Fd
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(Lattice fermion models (Hubbard model, etc.))
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| Fund: Stimulating discussions with Zhenghao Yang are gratefully acknowledged.Project supported by the National Natural Science Foundation of China (Grant No.11974293). |
Corresponding Authors:
Xiancong Lu
E-mail: xlu@xmu.edu.cn
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Cite this article:
Conghao Lin(林丛豪), Chuanshuai Huang(黄传帅), and Xiancong Lu(卢仙聪) Customizing topological phases in the twisted bilayer superconductors with even-parity pairings 2023 Chin. Phys. B 32 087401
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