Role of Fe intercalation on transition-metal dichalcogenide Fe_1/3+δNbS₂

Among 3d transition metal intercalated transition-metal dichalcogenides (TMDCs), Fe_1/3+δNbS₂ has been found to possess two competing and highly tunable long-range ordered magnetic ground states -- antiferromagnetic stripe and zigzag orders, which can lead to intriguing resistance switching and magnetic memory effects. However, how the intercalated Fe atoms interact with the van der Waals bonded host material electronically remains unclear. Here, combining angle-resolved photoemission spectroscopy (ARPES) with DFT calculations, we systematically study the electronic structure of Fe_1/3+δNbS₂. The electronic bands are significantly adjusted to the superlattice. We discuss the orbital selective charge transfer scenarios between the intercalated Fe and the NbS₂ layers. We also discuss the evolution of the electronic structure associated with the antiferromagnetic phase transition.Finally, we will discuss the effect of electronic correlation in the 3d transition metal intercalated TMDCs, especially in comparison to the weak coupling theories used to describe this material family.