Evidence of strong correlations at the van Hove singularity in the scanning tunneling spectra of superconducting Bi2Sr2CaCu2O8+delta single crystals

Article

关键词: RESOLVED PHOTOEMISSION-SPECTROSCOPY;    2-DIMENSIONAL ANGULAR-CORRELATION;    T-MATRIX APPROXIMATIONS;    MUFFIN-TIN ALLOYS;    FERMI-SURFACE;    ANNIHILATION RADIATION;    OXIDE SUPERCONDUCTORS;    ELECTRONIC-STRUCTURE;    COMPTON-SCATTERING;    MOMENTUM DENSITIES;   

DOI  :  10.1103/PhysRevB.85.214504

来源: SCIE

【 摘 要 】

We present realistic multiband calculations of scanning tunneling spectra in Bi2Sr2CaCu2O8+delta over a wide doping range. Our modeling incorporates effects of a competing pseudogap and pairing gap as well as effects of strong electronic correlations, which are included by introducing self-energy corrections in the one-particle propagators. The calculations provide a good description of the two-gap features seen in experiments at low energies and the evolution of the van Hove singularity (VHS) with doping, and suggest a possible quantum critical point near the point where the VHS crosses the Fermi level.

【 授权许可】

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