Abstract
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.
基金项目
国家重点研发计划(2022YFA1403900)
国家自然科学基金(11888101)
国家自然科学基金(12174428)
国家自然科学基金(11920101005)
中国科学院战略规划重点项目(XDB28000000)
中国科学院战略规划重点项目(XDB33000000)
New Cornerstone Investigator Program,and the Chinese Academy of Sciences Project for Young Scientists in Basic Research(2022YSBR-048)
U.S.Department of Energy,Basic Energy Sciences(DE-FG02-99ER45747)
NETL
NSTL
万方数据