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Spin-polarized pairing induced by the magnetic field in the Bernal bilayer graphene |
| Yan Huang(黄妍) and Tao Zhou(周涛)† |
| Guangdong Basic Research Center of Excellence for Structure and Fundamental Interactions of Matter, Guangdong Provincial Key Laboratory of Quantum Engineering and Quantum Materials, School of Physics, Guangdong-Hong Kong Joint Laboratory of Quantum Matter, and Frontier Research Institute for Physics, South China Normal University, Guangzhou 510006, China |
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Abstract Recent experimental findings have demonstrated the occurrence of superconductivity in Bernal bilayer graphene when induced by a magnetic field. In this study, we conduct a theoretical investigation of the potential pairing symmetry within this superconducting system. By developing a theoretical model, we primarily calculate the free energy of the system with p+ip-wave parallel spin pairing, p+ip-wave anti-parallel spin pairing and d+id-wave pairing symmetry. Our results confirm that the magnetic field is indeed essential for generating the superconductivity. We discover that the p+ip-wave parallel spin pairing leads to a lower free energy for the system. The numerical calculations of the energy band structure, zero-energy spectral function and density of states for each of the three pairing symmetries under consideration show a strong consistency with the free energy results.
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Received: 13 September 2023
Revised: 20 November 2023
Accepted manuscript online: 28 November 2023
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PACS:
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74.70.Wz
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(Carbon-based superconductors)
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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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74.20.Rp
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(Pairing symmetries (other than s-wave))
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| Fund: Project supported by the National Natural Science Foundation of China (Grant No. 12074130) and the Natural Science Foundation of Guangdong Province (Grant No. 2021A1515012340). |
Corresponding Authors:
Tao Zhou
E-mail: tzhou@scnu.edu.cn
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Cite this article:
Yan Huang(黄妍) and Tao Zhou(周涛) Spin-polarized pairing induced by the magnetic field in the Bernal bilayer graphene 2024 Chin. Phys. B 33 047403
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