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Hydrogen-rich materials offer a compelling avenue towards room temperaturesuperconductivity, albeit under ultra-high pressure. However, the experimentalinvestigation of the electronic band structure remains elusive, due to theinherent instability of most of the hydrogen-rich materials upon pressurerelease. Very recently, nitrogen-doped lutetium hydride was claimed to hostroom temperature superconductivity under near ambient pressure but wasdisproven by following works. Upon decompression, nitrogen doped lutetiumhydride manifests a stable metallic phase with dark blue color. Moreover, hightemperature superconductivity has been reported in lutetium hydrides Lu4H23(~71 K) under around 200 GPa. These properties engender an unprecedentedopportunity, allowing for the experimental investigation of the electronic bandstructure intrinsic to hydrogen-rich material. In this work, using angleresolved photoemission spectroscopy to investigate the non-superconductingnitrogen doped lutetium hydride, we observed significant flat band and Van Hovesingularity marginally below the Fermi level. These salient features,identified as critical elements, proffer potential amplifiers for therealization of heightened superconductivity, as evidenced by prior research.Our results not only unveil a confluence of potent strong correlation effectsand anisotropy within the Lu-H-N compound, but also provide a prospect forengineering high temperature superconductivity through the strategicmanipulation of flat band and the VHS, effectively tailoring their alignmentwith the Fermi energy.

Observation of Flat Band and Van Hove Singularity in Non-superconducting Nitrogen-doped Lutetium Hydride