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The prediction of high $T_c$ superconductivity in layers of LaNiO$_3$ throughorbital engineering has led to extensive research efforts over the last fifteenyears. During this period, a plethora of thin films and heterostructures basedrare-earth nickelate family with perovskite structure has been synthesized andexplored. In this short perspective, we briefly review the complexity of bulk$RE$NiO$_3$, spotlighting several recent findings of emergent phenomena inheterostructures containing the interface between $RE$NiO$_3$ and anothertransition metal oxide. Finally, we outline potentially interesting futuredirections linked to time-domain dynamics to harness new Mott and topologicalphases in artificial structures of $RE$NiO$_3$.

PERSPECTIVE: Emergent phases in rare earth nickelate heterostructures