Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2005-08-04
Phys. Rev. B 72, 205114 (2005)
Physics
Condensed Matter
Strongly Correlated Electrons
10 pages, 5 figures
Scientific paper
10.1103/PhysRevB.72.205114
ARPES spectra hold a wealth of information about the many-body interactions in a correlated material. However, the quantitative analysis of ARPES spectra to extract the various coupling parameters in a consistent manner is extremely challenging, even for a model Fermi liquid system. We propose a fitting procedure which allows quantitative access to the intrinsic lineshape, deconvolved of energy and momentum resolution effects, of the correlated 2-dimensional material Sr2RuO4. For the first time in correlated 2-dimensional materials, we find an ARPES linewidth that is narrower than its binding energy, a key property of quasiparticles within Fermi liquid theory. We also find that when the electron-electron scattering component is separated from the electron-phonon and impurity scattering terms it decreases with a functional form compatible with Fermi liquid theory as the Fermi energy is approached. In combination with the previously determined Fermi surface, these results give the first complete picture of a Fermi liquid system via ARPES. Furthermore, we show that the magnitude of the extracted imaginary part of the self-energy is in remarkable agreement with DC transport measurements.
Baumberger F.
Damascelli Andrea
Ingle N. J. C.
Kimura Tadahiko
Lu Ding H.
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