Epitaxial thin film synthesis of correlated kagome metal Ni₃In

The kagome lattice is a promising platform for investigating the interplay between topology and correlation as it naturally hosts both linear Dirac and dispersionless flat bands, as has recently been reported in the quasi-two dimensional transition metal stannide compounds (Fe, Co)Sn [1]. Going beyond the single layer paradigm, it has recently been demonstrated that the AB-stacked kagome system Ni₃In hosts a correlated metallic state in close proximity to a lattice-borne flat band [2]. Here we report the synthesis of high quality Ni₃In thin films grown by molecular beam epitaxy. We will also discuss electronic transport properties of this system in connection with the flat band compared with other kagome metals.