论文标题
库仑块超导体中亚gap状态的多发传输光谱
Multiterminal transport spectroscopy of subgap states in Coulomb-blockaded superconductors
论文作者
论文摘要
子仪态负责混合超导 - 良性导向设备的低偏置运输特征。在这里，我们分析了具有不同空间结构的子段状态的库仑块多端超导岛的局部和非局部差分电导。其运输光谱的新兴模式用于表征这些设备的拓扑性质，并提供控制其运输特性的可能性。我们开发了一个临近领先的主方程，以描述具有强库仑相互作用和多个子段状态的超导体中的多次传输，并加上金属铅。我们表明，非局部差分电导表征了子段状态的空间延伸，并在设备的不同部位具有有限的支撑信号，并信号具有退化结合状态的存在。此外，它显示出尖锐的符号变化，这是超导体诱导电荷的函数，在其最低激发状态下，信号传递交叉点。
Subgap states are responsible for the low-bias transport features of hybrid superconducting--semiconducting devices. Here, we analyze the local and nonlocal differential conductance of Coulomb-blockaded multiterminal superconducting islands that host subgap states with different spatial structures. The emerging patterns of their transport spectroscopy are used to characterize the possible topological nature of these devices and offer the possibility of controlling their transport properties. We develop a next-to-leading order master equation to describe the multiterminal transport in superconductors with both strong Coulomb interactions and multiple subgap states, coupled with metallic leads. We show that the nonlocal differential conductance characterizes the spatial extension of the subgap states and signals the presence of degenerate bound states with a finite support on different parts of the device. Additionally, it displays sharp sign changes as a function of the induced charge of the superconductor, signaling energy crossings among its lowest excited states.
