Origin of photoemission final-state effects in Bi2Sr2CaCu2O8 by very-low-energy electron diffraction

Article

关键词: ANGLE-RESOLVED PHOTOEMISSION;    BAND-STRUCTURE;    FERMI-SURFACE;    PHYSICAL-PROPERTIES;    SUPERCONDUCTORS;    SPECTROSCOPY;    PHASE;    VSE2;   

DOI  :  10.1103/PhysRevB.68.144509

来源: SCIE

【 摘 要 】

Very-low-energy electron diffraction with a support of full-potential band calculations is used to achieve the energy positions, dispersions, lifetimes, and Fourier compositions of the photoemission final states in Bi2Sr2CaCu2O8 at excitation energies below 45 eV. We find (1) highly structured final states that explain the dramatic photon energy dependences in photoemission; (2) a photoelectron lifetime decrease above 30 eV, resulting in increased damping of these dependences; (3) an intense c(2x2) diffraction below 25 eV, which reveals a significant extrinsic contribution to the shadow Fermi surface due to final-state diffraction. In a perspective, the experimental final states can be utilized to tune the photoemission experiment on specific valence states or Fermi surface replicas.

【 授权许可】

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