The recent discovery of high-temperature superconductivity in both bulk and thin-film bilayer nickelates La_(3)Ni_(2)O_(7) has garnered significant attention.However,the corresponding pairing symmetry remains debated ...The recent discovery of high-temperature superconductivity in both bulk and thin-film bilayer nickelates La_(3)Ni_(2)O_(7) has garnered significant attention.However,the corresponding pairing symmetry remains debated in both experiments and theoretical studies due to conflicting experimental evidence from bulk and thin-film materials.In this work,we examine the electronic Raman response across different channels for various pairing symmetries within a two-orbital bilayer model.By comparing Raman susceptibilities obtained from multiorbital and band-additive approaches,we demonstrate that Raman response can distinguish between different pairing symmetries and identify pocket-dependent gap amplitudes for both fully gapped and nodal superconducting states.Specifically,the nodal d_(x^(2)-y^(2))/d_(xy)-wave pairing exhibits robust low-energy power-law behavior,distinct from a fully gapped pairing.Additionally,for the s±-wave pairing,the detailed gap anisotropy on theβpocket can be determined.Possible experimental implications are also discussed.Our results highlight the crucial role of multiorbital effects in shaping the Raman spectra and establish electronic Raman scattering as a powerful and symmetry-resolved probe for determining the superconducting gap in unconventional superconductors.展开更多
基金supported by the National Natural Science Foundation of China(Grant Nos.12494594,11920101005,11888101,12047503,12322405,and 12104450as well as 12574151,12447103 and 12447101 for X.W.)+4 种基金the Ministry of Science and Technology(Grant No.2022YFA1403901)the New Cornerstone Investigator Programthe National Key R&D Program of China(Grant No.2023YFA1407300 for X.W.)the Max-Planck-Institute for Solid State Research in Stuttgart for hospitality and financial supportfunded by the Deutsche Forschungsgemeinschaft(DFG,German Research Foundation-TRR 360-492547816)。
文摘The recent discovery of high-temperature superconductivity in both bulk and thin-film bilayer nickelates La_(3)Ni_(2)O_(7) has garnered significant attention.However,the corresponding pairing symmetry remains debated in both experiments and theoretical studies due to conflicting experimental evidence from bulk and thin-film materials.In this work,we examine the electronic Raman response across different channels for various pairing symmetries within a two-orbital bilayer model.By comparing Raman susceptibilities obtained from multiorbital and band-additive approaches,we demonstrate that Raman response can distinguish between different pairing symmetries and identify pocket-dependent gap amplitudes for both fully gapped and nodal superconducting states.Specifically,the nodal d_(x^(2)-y^(2))/d_(xy)-wave pairing exhibits robust low-energy power-law behavior,distinct from a fully gapped pairing.Additionally,for the s±-wave pairing,the detailed gap anisotropy on theβpocket can be determined.Possible experimental implications are also discussed.Our results highlight the crucial role of multiorbital effects in shaping the Raman spectra and establish electronic Raman scattering as a powerful and symmetry-resolved probe for determining the superconducting gap in unconventional superconductors.
