Angle-resolved photoemission spectroscopy study of   HgBa$_{2}$CuO$_{4+\delta}$
  HgBa$_{2}$CuO$_{4+\delta}$ (Hg1201) has been shown to be a model cuprate for scattering, optical, and transport experiments, but angle-resolved photoemission spectroscopy (ARPES) data are still lacking owing to the absence of a charge-neutral cleavage plane. We report on progress in achieving the experimental conditions for which quasiparticles can be observed in the near-nodal region of the Fermi surface. The d-wave superconducting gap is measured and found to have a maximum of 39 meV. At low temperature, a kink is detected in the nodal dispersion at approximately 51 meV below the Fermi level, an energy that is different from other cuprates with comparable T$_c$. The superconducting gap, Fermi surface, and nodal band renormalization measured here provide a crucial momentum-space complement to other experimental probes. 
I. M. Vishik, N. Bari\v{s}i\'c, M.K. Chan, Y. Li, D. D. Xia, G. Yu, X.   Zhao, W. S. Lee, W. Meevasana, T. P. Devereaux, M. ...
cond-mat.supr-con cond-mat.str-el