Mikheev Evgeny, Rosen Ilan T, Goldhaber-Gordon David
Department of Physics, Stanford University, Stanford, CA 94305, USA.
Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, Menlo Park, CA 94025, USA.
Sci Adv. 2021 Oct;7(40):eabi6520. doi: 10.1126/sciadv.abi6520. Epub 2021 Oct 1.
Superconductivity in SrTiO occurs at remarkably low carrier densities and therefore, unlike conventional superconductors, can be controlled by electrostatic gates. Here, we demonstrate nanoscale weak links connecting superconducting leads, all within a single material, SrTiO. Ionic liquid gating accumulates carriers in the leads, and local electrostatic gates are tuned to open the weak link. These devices behave as superconducting quantum point contacts with a quantized critical supercurrent. This is a milestone toward establishing SrTiO as a single-material platform for mesoscopic superconducting transport experiments that also intrinsically contains the necessary ingredients to engineer topological superconductivity.
钛酸锶中的超导现象在极低的载流子密度下出现，因此，与传统超导体不同，它可以通过静电栅极进行控制。在这里，我们展示了在单一材料钛酸锶内连接超导引线的纳米级弱连接。离子液体门控在引线中积累载流子，并且通过调整局部静电栅极来打开弱连接。这些器件表现为具有量子化临界超电流的超导量子点接触。这是朝着将钛酸锶确立为介观超导输运实验的单一材料平台迈出的一个里程碑，该平台本质上也包含了设计拓扑超导所需的要素。
