The Electronic Structure of (La, Ce)Te2 System: Interplay between different degrees of freedom

Rare earth tellurides (La,Ce)Te$_{2}$ are interesting layered materials showing Charge Density Wave (CDW) formation with transition temperature of the order of 1000K. By substituting La with Ce, coexistence between magnetism and CDW is observed. Angle resolved photoemission spectroscopy (ARPES) is an ideal tool to study the competition and coexistence of these two phases, since it directly probes quasiparticles and many-body interaction. Here we report a detailed ARPES study as a function of momentum, temperature and composition of the (La, Ce)Te$_{2}$ system. The Fermi surface geometry in the CDW phase, the formation of the CDW gap and its anisotropy, as well as the ARPES lineshapes will be presented. The competition and cooperation between different degrees of freedom will be discussed.