Various phenomena occur when two-dimensional materials, such as graphene or transition metal dichalcogenides, are assembled into bilayers with a twist between the individual layers. As an application of this paradigm, we predict that structures composed of two-monolayer-thin d-wave superconductors with a twist angle form a robust, fully gapped topological phase with spontaneously broken time-reversal symmetry and protected chiral Majorana edge modes. These structures can be realized by mechanically exfoliating van der Waals-bonded high-critical-temperature copper oxide materials, such as Bi₂Sr₂CaCu₂O_8 + δ. Our symmetry arguments and detailed microscopic modelling suggest that this phase will form for a range of twist angles in the vicinity of 45°, and will set in at a temperature close to the bulk superconducting critical temperature of 90 K. Therefore, this platform may provide a long-sought realization of a true high-temperature topological superconductor.

当二维材料（例如石墨烯或过渡金属二硫属化物）组装成双层时，会出现各种现象，并且各个层之间会发生扭曲。作为该范式的应用，我们预测由具有扭转角的两个单层薄d波超导体组成的结构形成坚固的、完全间隙的拓扑相，具有自发破坏的时间反转对称性和受保护的手性马约拉纳边缘模式。这些结构可以通过机械剥离范德华键合的高临界温度氧化铜材料来实现，例如 Bi ₂ Sr ₂ CaCu ₂ O _{8 +  δ}. 我们的对称论点和详细的微观模型表明，该相将在 45° 附近的一系列扭转角内形成，并将在接近 90 K 的体超导临界温度的温度下开始。因此，该平台可以提供长期寻求实现真正的高温拓扑超导体。