ARPES studies of model cuprate high-temperature superconductor*

HgBa₂CuO_4+d (Hg1201) is a model single-layer cuprate which has uniquely elucidated the cuprate phase diagram via transport, scattering, and optics studies, but it has received relatively little ARPES study owing to the difficulty in cleaving and achieving good photoemission cross-section. We will discuss recent progress in identifying three energy scales of interactions near the node and evaluating their evolution with doping, temperature, and momentum. We will also discuss recent progress in identifying experimental conditions which optimize antinodal spectra.