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Niobium halides, Nb3X8 (X = Cl,Br,I), which are predicted two-dimensionalmagnets, have recently gotten attention due to their breathing kagome geometry.Here, we have studied the electronic structure of Nb3Br8 by usingangle-resolved photoemission spectroscopy (ARPES) and first-principlescalculations. ARPES results depict the presence of multiple flat and weaklydispersing bands. These bands are well explained by the theoreticalcalculations, which show they have Nb d character indicating their originationfrom the Nb atoms forming the breathing kagome plane. This van der Waalsmaterial can be easily thinned down via mechanical exfoliation to the ultrathinlimit and such ultrathin samples are stable as depicted from the time-dependentRaman spectroscopy measurements at room temperature. These results demonstratethat Nb3Br8 is an excellent material not only for studying breathing kagomeinduced flat band physics and its connection with magnetism, but also forheterostructure fabrication for application purposes.

Observation of flat and weakly dispersing bands in a van der Waals semiconductor Nb3Br8 with breathing kagome lattice