Sublattice dichotomy in monolayer FeSe/SrTiO_(3),signaling the breaking of symmetries exchanging the two Fe sublattices,has recently been reported.We propose that interband pairing serves as the origin of this dichoto...Sublattice dichotomy in monolayer FeSe/SrTiO_(3),signaling the breaking of symmetries exchanging the two Fe sublattices,has recently been reported.We propose that interband pairing serves as the origin of this dichotomy,regardless of whether the symmetries are broken in the normal state or in the pairing state.If symmetry breaking occurs in the normal state,the Fermi surfaces are sublattice-polarized,and the intersublattice d-wave pairing naturally acts as interband pairing,reproducing the observed dichotomy in the spectra.Alternatively,if symmetry breaking takes place in the pairing state,the dichotomy arises from the coexistence of intraband and interband pairing,with the constraint that interband pairings share the same sign while intraband pairings carry opposite signs.In both cases,interband pairing is indispensable,establishing it as a key ingredient for understanding superconductivity in monolayer FeSe/SrTiO_(3).展开更多
基金supported by the Ministry of Science and Technology(Grant No.2022YFA1403900)the National Natural Science Foundation of China(Grant Nos.12494594,12174428,and 12304163)+2 种基金the New Cornerstone Investigator Programthe Chinese Academy of Sciences Project for Young Scientists in Basic Research(Grant No.2022YSBR-048)the Beijing Institute of Technology Research Fund Program for Young Scholars。
文摘Sublattice dichotomy in monolayer FeSe/SrTiO_(3),signaling the breaking of symmetries exchanging the two Fe sublattices,has recently been reported.We propose that interband pairing serves as the origin of this dichotomy,regardless of whether the symmetries are broken in the normal state or in the pairing state.If symmetry breaking occurs in the normal state,the Fermi surfaces are sublattice-polarized,and the intersublattice d-wave pairing naturally acts as interband pairing,reproducing the observed dichotomy in the spectra.Alternatively,if symmetry breaking takes place in the pairing state,the dichotomy arises from the coexistence of intraband and interband pairing,with the constraint that interband pairings share the same sign while intraband pairings carry opposite signs.In both cases,interband pairing is indispensable,establishing it as a key ingredient for understanding superconductivity in monolayer FeSe/SrTiO_(3).
