| CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
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High-Temperature Superconductivity in La$_3$Ni$_2$O$_7$ |
| Kun Jiang1,2, Ziqiang Wang3, and Fu-Chun Zhang4,5 |
1Beijing National Laboratory for Condensed Matter Physics, and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
2School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100190, China
3Department of Physics, Boston College, Chestnut Hill, MA 02467, USA
4Kavli Institute of Theoretical Sciences, University of Chinese Academy of Sciences, Beijing 100190, China
5Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, China
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| Cite this article: |
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Kun Jiang, Ziqiang Wang, and Fu-Chun Zhang 2024 Chin. Phys. Lett. 41 017402 |
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Abstract Motivated by the recent discovery of high-temperature superconductivity in bilayer La$_3$Ni$_2$O$_7$ under pressure, we study its electronic properties and superconductivity due to strong electron correlation. Using the inversion symmetry, we decouple the low-energy electronic structure into block-diagonal symmetric and antisymmetric sectors. It is found that the antisymmetric sector can be reduced to a one-band system near half filling, while the symmetric bands occupied by about two electrons are heavily overdoped individually. Using the strong coupling mean field theory, we obtain strong superconducting pairing with $B_{\rm 1g}$ symmetry in the antisymmetric sector. We propose that due to the spin-orbital exchange coupling between the two sectors, $B_{\rm 1g}$ pairing is induced in the symmetric bands, which in turn boosts the pairing gap in the antisymmetric band and enhances the high-temperature superconductivity with a congruent d-wave symmetry in pressurized La$_3$Ni$_2$O$_7$.
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Received: 11 December 2023
Express Letter
Published: 10 January 2024
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| PACS: |
74.20.-z
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(Theories and models of superconducting state)
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74.70.-b
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(Superconducting materials other than cuprates)
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74.72.-h
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(Cuprate superconductors)
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