Vortical versus skyrmionic states in the topological phase of a twisted bilayer with $d$-wave superconducting pairing

Leonardo R. Cadorim, Edson Sardella, Milorad V. Milošević

It was recently shown that a chiral topological phase emerges from the coupling of two twisted monolayers of superconducting Bi${}_2$Sr${}_2$CaCu${}_2$O${}_{8+\delta }$ for certain twist angles.…