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We have performed an \it {ab initio} investigation of transition metals (TMs= Mo, Ru, Co, and Pt) embedded in twisted bilayer graphene (tBG) layers. Ourtotal energy results reveal that, triggered by the misalignment between thegraphene layers, Mo and Ru atoms may form a quasi-periodic (triangular) arrayof intercalated atoms. In contrast, the formation of those structures is notexpected for the other TMs, Co and Pt atoms. The net magnetic moment (m) of Moand Ru atoms may be quenched upon intercalation, depending on the stackingregion (AA or AB). For instance, we find a magnetic moment of 0.3 $\mu_{\rm B}$(1.8 $\mu_{\rm B}$) for Ru atoms intercalated between the AA (AB) regions ofthe stacked twisted layers. Through simulated scanning tunneling microscopy(STM) images, we verify that the presence of intercalated TMs can be identifiedby the formation of bright (hexagonal) spots lying on the graphene surface.

Periodic arrays of intercalated atoms in twisted bilayer graphene: an \it{ ab initio} investigation