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Parity symmetric photoemission spectra are ubiquitous in solid stateresearch, being prevalent in many highly active areas, such as unconventionalsuperconductors, nonmagnetic and antiferromagnetic topological insulators, andweakly relativistic collinear magnets, among others. The direct observation ofparity-violating metallic Kramers degenerate bands has remained hithertoexperimentally elusive. Here we observe the antiferromagnetic parity violation(APV) in the bandstructure of Mn$_2$Au thin films by using momentum microscopywith sub-$mu$m spatial resolution, allowing momentum resolved photoemission onsingle antiferromagnetic domains. The APV arises from breaking the P symmetryof the underlying crystal structure by the collinear antiferromagnetism, whilepreserving the joint space-time inverison PT -symmetry and in combination withlarge spin-orbit coupling. In addition, our work also demonstrates a novel toolto directly image the Neel vector direction by combining spatially resolvedmomentum microscopy with ab-initio calculations.

Direct Observation of Antiferromagnetic Parity Violation in the Electronic Structure of Mn$_2$Au