Superconducting proximity devices using low-dimensional semiconducting elements enable a ballistic regime in the proximity transport. The use of topological insulators in such devices is considered promising owing to the peculiar transport properties these materials offer, as well the hope of inducing topological superconductivity and Majorana phenomena via proximity effects. Here we demonstrate the fabrication and superconducting properties of proximity Josephson devices integrating nanocrystals single of Bi₂Te_2.3Se_0.7 with a thickness of a few unit cells. Single junctions display typical characteristics of planar Josephson devices; junctions integrating two nanocrystals behave as nanodimensional superconducting quantum interference devices. A peculiar temperature and magnetic field evolution of the Josephson current along with the observed excess current effect point towards the ballistic proximity regime of topological channels. This suggests the proposed devices are promising for testing topological superconducting phenomena in two-dimensions.

使用低维半导体元件的超导接近装置可以在接近传输中实现弹道状态。由于这些材料具有特殊的传输特性，并且在此类设备中使用拓扑绝缘体被认为是有前途的，并且希望通过邻近效应来引发拓扑超导性和Majorana现象。在这里，我们展示了结合了Bi ₂ Te _2.3 Se _0.7的单纳米晶体的约瑟夫森器件的制造和超导性能。厚度为几个单位单元。单结显示了平面约瑟夫森器件的典型特性。集成两个纳米晶体的金属结充当纳米级超导量子干涉装置。约瑟夫森电流的奇特温度和磁场演化以及所观察到的过剩电流效应都指向拓扑通道的弹道接近状态。这表明所提出的设备有望用于二维测试拓扑超导现象。