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, ω). 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.