Photoemission Spectroscopy on High Temperature Superconductor by Wentao Zhang

Author:Wentao Zhang
Language: eng
Format: epub
Publisher: Springer Berlin Heidelberg, Berlin, Heidelberg

Fig. 4.3The MDC dispersion and MDC width as a function of energy by fitting the raw spectra in Fig. 4.2(a)

From Eq. 4.2, one can extract the real part of electron self-energy from the MDC dispersion given that the bare band dispersion is known which can be determined in a number of ways but still without a consensus [15, 25, 26]. To identify fine features in the electron self-energy and study their relative change with temperature, it is reasonable to assume a featureless bare band for the nodal dispersion within a small energy window near the Fermi energy. In this case, the fine features manifest themselves either as peaks or curvature changes in the “effective self-energy” [25]. As shown in Fig. 4.3, we choose here a straight line connecting two energy positions in the dispersion at the Fermi energy and −0.4 eV as the empirical bare band. The resultant effective real part of electron self-energy, which represents the energy difference between the measured dispersion and the selected bare band, is shown in Fig. 4.4. With much improved precision of data, one can identify clearly several features in the electron self-energy, as shown in Fig. 4.4. The most pronounced feature is the peak at ∼70 meV that gives rise to the kink in dispersion seen here and before. In addition, at higher energies, two new features can be identified clearly as a valley at ∼115 meV and a cusp at ∼150 meV.

Fig. 4.4The effective real part of the electron self-energy by subtracting the bare band from MDC dispersion in Fig. 4.3

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