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Condensed matter systems with flat bands have been the center of researchinterest in recent years as they provide a platform for the emergence of exoticmany-body states, such as superconductivity, ferromagnetism, and the fractionalquantum Hall effect. However, realization of materials possessing at bands nearthe Fermi level experimentally is very rare. Here, we report the experimentalobservation of flat bands in a weakly-correlated system YRu2Si2 employingangle-resolved photoemission spectroscopy (ARPES) which is supported byfirst-principles calculations. These flat bands originate from Ru d orbitalsand are found to be sensitive to the polarization of light. In addition, ARPESdata revealed surface and bulk Dirac-like bands. The observed ARPES data is inexcellent agreement with the density functional theory results. The presence ofboth flat bands and Dirac-like bands in YRu2Si2 suggest a unique synergy ofcorrelation and topology in this material belonging to the centrosymmetrictetragonal ThCr2Si2-type structure thus establishing a new platform toinvestigate flat band physics in combination with non-trivial topologicalstates in a weakly correlated system.

Observation of flat bands and Dirac-like bands in a weakly correlated semimetal YRu2Si2