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Two-dimensional van der Waals materials have become an established platformto engineer flat bands which can lead to strongly-correlated emergentphenomena. In particular, the family of Ta dichalcogenides in the 1\textit{T}phase presents a star-of-David charge density wave that creates a flat band atthe Fermi level. For TaS$_2$ and TaSe$_2$ this flat band is at half fillingleading to a magnetic insulating phase. In this work, we theoreticallydemonstrate that ligand substitution in the TaSe$_{2-x}$Te$_x$ system producesa transition from the magnetic insulator to a non-magnetic metal in which theflat band gets doped away from half-filling. For $x\in[{0.846},{1.231}]$ thespin-polarized flat band is self-doped and the system becomes a magnetic metal.In this regime, we show that attractive interactions promote three differentspin-triplet superconducting phases as a function of $x$, corresponding to anodal f-wave and two topologically-different chiral p-wave superconductingphases. Our results establish monolayer TaSe$_{2-x}$Te$_{x}$ as a promisingplatform for correlated flat band physics leading to unconventionalsuperconducting states.

Self-doped flat band and spin-triplet superconductivity in monolayer 1T-TaSe$_{2-x}$Te$_{x}$