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The lamellar cuprate superconductors exhibit the highest ambient-pressuresuperconducting transition temperatures (T$_C$) and, after more than threedecades of extraordinary research activity, continue to pose formidablescientific challenges. A major experimental obstacle has been to distinguishuniversal phenomena from materials- or technique-dependent ones. Angle-resolvedphotoemission spectroscopy (ARPES) measures momentum-dependent single-particleelectronic excitations and has been invaluable in the endeavor to determine theanisotropic momentum-space properties of the cuprates. HgBa$_2$CuO$_{4+\delta}$(Hg1201) is a single-CuO$_2$-layer cuprate with a particularly high optimalT$_C$ and a simple crystal structure; yet there exists little information fromARPES about the electronic properties of this model system. Here we present anARPES study of doping-, temperature-, and momentum-dependent systematics ofnear-nodal dispersion anomalies in Hg1201. The data reveal a hierarchy of threedistinct energy scales -a sub-gap low-energy kink, an intermediate-energy kinknear 55 meV, and a peak-dip-hump structure. The first two features areattributed to the coupling of electrons to Ba-derived optical phonons andin-plane bond-stretching phonons, respectively. The nodal peak-dip-humpstructure appears to have a common doping-dependence in several single-layercuprates, and is interpreted as a manifestation of pseudogap physics at thenode. These results establish several universal phenomena, both in terms ofconnecting multiple experimental techniques for a single material, and in termsof connecting comparable spectral features in multiple structurally similarcuprates.

Three interaction energy scales in single-layer high-T$_C$ cuprate HgBa$_2$CuO$_{4+\delta}$