Angle-resolved photoemission spectroscopy (ARPES)

When light strikes a material, it can eject electrons from its surface. By measuring the energy and momentum of these photoemitted electrons, one can reconstruct a detailed picture of how electrons are arranged and propagate inside the solid. This is the essence of angle-resolved photoemission spectroscopy (ARPES), one of the most direct experimental probes of the momentum-resolved electronic structure of quantum materials.

Beyond mapping band dispersions and Fermi surfaces, ARPES is uniquely sensitive to the fingerprints of many-body effects: the measured spectral lineshapes, quasiparticle weights, and self-energy renormalizations encode the strength and character of electron-electron, electron-phonon, and other many-body interactions. As a result, ARPES has become an indispensable tool for the study of correlated materials such as cuprate superconductors, transition-metal oxides, and topological systems.

Our group exploits the full power of ARPES, including polarization-dependent and laser-based measurements, to probe the interplay of charge, spin, orbital, and lattice degrees of freedom in quantum materials, providing direct experimental insight into the many-body physics that underlies their remarkable properties.