Angle-resolved photoelectron spectroscopy on the Fermi liquid reference compound TiTe2

The layered compound TiTe2 can, for several reasons, be viewed as an ideal candidate for electron spectroscopic studies of Fermi liquid behavior. High-resolution angle-resolved photoemission (ARPES) spectra near the Fermi energy reflect the expected energy renormalization and lifetime narrowing of the quasiparticle excitations. These results support a many-body interpretation of ARPES on low-energy excitations in terms of the spectral function A(k,omega). We further present ARPES data measured in the constant energy mode and suggest a new method for obtaining precise information on the Fermi surface, which utilizes the discontinuity in the momentum distribution function of a Fermi liquid.