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Terahertz (THz) Spintronic emitters based on ferromagnetic/metal junctionshave become an important technology for the THz range, offering powerful andultra-large spectral bandwidths. These developments have driven recentinvestigations of two-dimensional (2D) materials for new THz spintronicconcepts. 2D materials, such as transition metal dichalcogenides (TMDs), areideal platforms for SCC as they possess strong spin-orbit coupling (SOC) andreduced crystal symmetries. Moreover, SCC and the resulting THz emission can betuned with the number of layers, electric field or strain. Here, epitaxiallygrown 1T-PtSe$_2$ and sputtered Ferromagnet (FM) heterostructures are presentedas a novel THz emitter where the 1T crystal symmetry and strong SOC favor SCC.High quality of as-grown PtSe$_2$ layers is demonstrated and further FMdeposition leaves the PtSe$_2$ unaffected, as evidenced with extensivecharacterization. Through this atomic growth control, the unique thicknessdependent electronic structure of PtSe$_2$ allows the control of the THzemission by SCC. Indeed, we demonstrate the transition from the inverseRashba-Edelstein effect in one monolayer to the inverse spin Hall effect inmultilayers. This band structure flexibility makes PtSe$_2$ an ideal candidateas a THz spintronic 2D material and to explore the underlying mechanisms andengineering of the SCC for THz emission.

Atomic-layer controlled THz Spintronic emission from Epitaxially grown Two dimensional PtSe$_2$/ferromagnet heterostructures