Würzburg ToCoTronics Colloquium

Angle-resolved photoemission spectroscopy provides direct access to the momentum-resolved electronic structure of quantum materials, allowing one to track band-gap crossovers, Fermi-surface reconstructions, and the effects of reduced dimensionality or surface projection. In this talk, I will present two recent ARPES studies carried out during my postdoctoral work at Paris-Saclay. The first concerns PbI2 thin films, where ARPES reveals a thickness-dependent indirect-to-direct band-gap crossover driven by interlayer coupling. The second focuses on FePd2Te2, a layered ferromagnet with quasi-one-dimensional Fe chains, where the measured electronic structure is strongly shaped by cleavage-plane projection, domain superposition, and photoemission matrix-element effects. Together, these examples illustrate how ARPES can be used to disentangle intrinsic electronic properties from geometrical and surface-related effects in complex quantum materials.