After almost twenty years of intense work on the celebrated LaAlO₃/SrTiO₃system, the recent discovery of a superconducting two-dimensional electron gas (2-DEG) in (111)-oriented KTaO₃-based heterostructures injects new momentum to the field of oxides interface. However, while both interfaces share common properties, experiments also suggest important differences between the two systems. Here, we report gate tunable superconductivity in 2-DEGs generated at the surface of a (111)-oriented KTaO₃ crystal by the simple sputtering of a thin Al layer. We extract the superfluid stiffness of the 2-DEGs and show that its temperature dependence is consistent with a node-less superconducting order parameter having a gap value larger than expected within a simple BCS weak-coupling limit model. The superconducting transition follows the Berezinskii-Kosterlitz-Thouless scenario, which was not reported on SrTiO₃-based interfaces. Our finding offers innovative perspectives for fundamental science but also for device applications in a variety of fields such as spin-orbitronics and topological electronics.

在对著名的 LaAlO ₃ /SrTiO _{3系统进行了近 20 年的紧张工作之后，最近在 (111) 取向的 KTaO 3}基异质结构中发现的超导二维电子气 (2-DEG)为该领域注入了新的动力氧化物界面。然而，虽然这两个接口具有共同的属性，但实验也表明了两个系统之间的重要差异。_{在这里，我们报告了在 (111) 取向的 KTaO 3}表面产生的 2-DEG 中的栅极可调谐超导性。通过简单的溅射薄Al层形成晶体。我们提取了 2-DEG 的超流体刚度，并表明其温度依赖性与在简单 BCS 弱耦合极限模型中间隙值大于预期的无节点超导有序参数一致。超导转变遵循 Berezinskii-Kosterlitz-Thouless 情景，这在基于 SrTiO ₃的界面上没有报道。我们的发现为基础科学以及自旋轨道电子学和拓扑电子学等多个领域的设备应用提供了创新视角。