Abstract
Angle resolved photoemission spectroscopy (ARPES) of high temperature superconductors has revealed an unusual behavior of line width and line shape, which has been interpreted as an indication for a Fermi liquid like ground state. The prototype for investigations of such ARPES line shapes in normal conductors is the isolated, strong and nearly non-dispersive Ti-3d derived emission near the Fermi level of the quasi twodimensional, metallic layer compound TiTe 2[1,2]. Comparing experimental photoemission data only with the initial states spectral density, a decision in favor of a Fermi liquid is not fully conclusive. Furthermore, that comparison shows a deviation from the Fermi liquid behavior in the vicinity of the M point, because of neglecting band structure effects. In order to clarify this problem we performed full theoretical calculations of photoemission spectra within the onestep model. For the initial states standard parametrizations of the Fermi liquid selfenergy were chosen. The resulting energy distribution curves for several angles of emission are reported. In addition many body effects in the final states were considered by properly calculating the optical potential in the GW-approximation.
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