论文标题
定向电子过滤在超导体 - 触发器界面
Directional electron-filtering at a superconductor-semiconductor interface
论文作者
论文摘要
我们评估了与杂交超导体 - 触发器界面电气转运的显微镜相关参数。与常用的几何金属系统相比，我们专注于具有不同电子特性（例如低接收器密度半导体）与超导体结合使用的材料，而无需施加几何限制。由于电子带结构的差异，我们发现了一种固有的模式选择性，一种定向动量过滤器，该差异会在半导体的相对侧产生电子储量的分离，同时选择几乎垂直于界面的模式。电子分离与以Andreev反射和低弹性后散射为主的传输电流并存，这均取决于半导体的栅极控制电子性能。
We evaluate the microscopically relevant parameters for electrical transport of hybrid superconductor-semiconductor interfaces. In contrast to the commonly used geometrically constricted metallic systems, we focus on materials with dissimilar electronic properties like low-carrier density semiconductors combined with superconductors, without imposing geometric confinement. We find an intrinsic mode-selectivity, a directional momentum-filter, due to the differences in electronic band-structure, which creates a separation of electron reservoirs each at the opposite sides of the semiconductor, while at the same time selecting modes propagating almost perpendicular to the interface. The electronic separation coexists with a transport current dominated by Andreev reflection and low elastic back-scattering, both dependent on the gate-controllable electronic properties of the semiconductor.
