Papers › High-temperature topological superconductivity in twisted double layer copper oxides
High-temperature topological superconductivity in twisted double layer copper oxides
Oguzhan Can, Tarun Tummuru, Ryan P. Day, Ilya Elfimov, Andrea Damascelli, Marcel Franz
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A great variety of novel phenomena occur when two-dimensional materials, such as graphene or transition metal dichalcogenides, are assembled into bilayers with a twist between individual layers. As a new application of this paradigm, we consider structures composed of two monolayer-thin d-wave superconductors with a twist angle θ that can be realized by mechanically exfoliating van der Waals-bonded high-T_c copper oxide materials, such as Bi₂Sr₂CaCu₂O_(8+δ). On the basis of symmetry arguments and detailed microscopic modelling, we predict that for a range of twist angles in the vicinity of 45ᵒ, such bilayers form a robust, fully gapped topological phase with spontaneously broken time-reversal symmetry and protected chiral Majorana edge modes. When θ≈45ᵒ, the topological phase sets in at temperatures close to the bulk T_c≃90 K, thus furnishing a long sought realization of a true high-temperature topological superconductor.
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