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High-Temperature Superconductivity in La3Ni2O7

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Motivated by the recent discovery of high-temperature superconductivity in bilayer La3Ni2O7 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 B1g symmetry in the antisymmetric sector.We propose that due to the spin-orbital exchange coupling between the two sectors,B1g 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 La3Ni2O7.

蒋坤、汪自强、张富春

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Beijing National Laboratory for Condensed Matter Physics,and Institute of Physics,Chinese Academy of Sciences,Beijing 100190,China

School of Physical Sciences,University of Chinese Academy of Sciences,Beijing 100190,China

Department of Physics,Boston College,Chestnut Hill,MA 02467,USA

Kavli Institute of Theoretical Sciences,University of Chinese Academy of Sciences,Beijing 100190,China

Collaborative Innovation Center of Advanced Microstructures,Nanjing University,Nanjing 210093,China

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国家重点研发计划国家自然科学基金国家自然科学基金国家自然科学基金中国科学院战略规划重点项目中国科学院战略规划重点项目New Cornerstone Investigator Program,and the Chinese Academy of Sciences Project for Young Scientists in Basic ResearchU.S.Department of Energy,Basic Energy Sciences

2022YFA1403900118881011217442811920101005XDB28000000XDB330000002022YSBR-048DE-FG02-99ER45747

2024

10.1088/0256-307X/41/1/017402

中国物理快报(英文版)
中国科学院物理研究所,中国物理学会

中国物理快报(英文版)

CSTPCDEI
影响因子：0.515
ISSN：0256-307X
年,卷(期)：2024.41(1)
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