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Possible nodeless s±-wave superconductivity in twisted bilayer graphene |
Zhe Liu(刘哲)1, Yu Li(李宇)1,2, Yi-Feng Yang(杨义峰)1,2,3,4 |
1 Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China;
2 University of Chinese Academy of Sciences, Beijing 100049, China;
3 Songshan Lake Materials Laboratory, Dongguan 523808, China;
4 Collaborative Innovation Center of Quantum Matter, Beijing 100190, China |
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Abstract The recent discovery of superconductivity in the twisted bilayer graphene has stimulated numerous theoretical proposals concerning its exact gap symmetry. Among them, the d+ id or p+ ip-wave was believed to be the most plausible solution. Here, considering that the superconductivity emerges near a correlated insulating state and may be induced by antiferromagnetic spin fluctuations, we apply the strong-coupling Eliashberg theory with both inter- and intraband quantum critical pairing interactions and discuss the possible gap symmetry in an effective low-energy four-orbital model. Our calculations reveal a nodeless s±-wave as the most probable candidate for the superconducting gap symmetry in the experimentally relevant parameter range. This solution is distinctly different from previous theoretical proposals. It highlights the multi-gap nature of the superconductivity and puts the twisted bilayer graphene in the same class as the iron-pnictide, electron-doped cuprate, and some heavy fermion superconductors.
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Received: 06 May 2019
Accepted manuscript online:
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PACS:
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71.27.+a
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(Strongly correlated electron systems; heavy fermions)
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74.70.Tx
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(Heavy-fermion superconductors)
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Fund: Project supported by the National Key R&D Program of China (Grant No. 2017YFA0303103), the National Natural Science Foundation of China (Grant Nos. 11774401 and 11522435), the State Key Development Program for Basic Research of China (Grant No. 2015CB921303), the Strategic Priority Research Program (B) of the Chinese Academy of Sciences (Grant No. XDB07020200), and the Youth Innovation Promotion Association of the Chinese Academy of Sciences. |
Corresponding Authors:
Yi-Feng Yang
E-mail: yifeng@iphy.ac.cn
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Cite this article:
Zhe Liu(刘哲), Yu Li(李宇), Yi-Feng Yang(杨义峰) Possible nodeless s±-wave superconductivity in twisted bilayer graphene 2019 Chin. Phys. B 28 077103
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