Direct observation of self-energy signatures of the resonant collective mode in Bi2Sr2CaCu2O8+delta

Article

关键词: ANGLE-RESOLVED PHOTOEMISSION;    T-C SUPERCONDUCTORS;    TRANSITION-TEMPERATURE;    MAGNETIC EXCITATIONS;    NEUTRON-SCATTERING;    ELECTRONIC-SPECTRA;    LINE-SHAPE;    DISPERSION;    STATE;    PSEUDOGAP;   

DOI  :  10.1103/PhysRevB.95.174501

来源: SCIE

【 摘 要 】

We use high-resolution angle-resolved photoemission spectroscopy to study the resonant, collective excitation mode in the superconducting state of Bi2212. By collecting very high-quality data we found noteworthy features in the self-energy in the antinodal region, where the interaction of electrons with the mode is the strongest. This interaction leads to a pronounced peak in the scattering rate and we demonstrate that this feature is directly responsible for the well-known peak-dip-hump structure in cuprates. By studying how the weight of this peak changes with temperature we unequivocally demonstrate that interaction of electrons with the resonant mode in cuprates vanishes at T-c and is very much localized in the momentum space close to the antinode. These findings present a consistent picture of line shape and self-energy signatures of the electron-boson coupling in cuprates and resolve long-standing controversy surrounding this issue. The momentum dependence of the strength of electron-mode interaction enables development of quantitative theory of this phenomenon in cuprates.

【 授权许可】

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