Electron Removal Self Energy and its application to Ca2CuO2Cl2

Details Electron Removal Self Energy and its application to Ca2CuO2Cl2 Electron Removal Self Energy and its application to Ca2CuO2Cl2

2007-08-10

arxiv.org/abs/0708.1358v1

Physical Review B 76, 104505 (2007)

Physics

Condensed Matter

Superconductivity

5 pages, 3 figures

Scientific paper

10.1103/PhysRevB.76.104505

We propose using the self energy defined for the electron removal Green's function. Starting from the electron removal Green's function, we obtained expressions for the removal self energy Sigma^ER (k,omega) that are applicable for non-quasiparticle photoemission spectral functions from a single band system. Our method does not assume momentum independence and produces the self energy in the full k-omega space. The method is applied to the angle resolved photoemission from Ca_2CuO_2Cl_2 and the result is found to be compatible with the self energy value from the peak width of sharp features. The self energy is found to be only weakly k-dependent. In addition, the Im Sigma shows a maximum at around 1 eV where the high energy kink is located.

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