论文标题
通过瞬态电流探测Andreev结合状态的电子孔重量
Probing electron-hole weights of an Andreev bound state by transient currents
论文作者
论文摘要
Andreev结合状态（ABS）是包含电子和孔成分的局部量子状态。它们无处不在地居住在不均匀的超导系统中。经过理论分析，我们建议通过局部隧穿测量值探测ABS的电子重量，该测量检测到脉冲偏置下的瞬时电流。使用我们的方案，也可以从瞬态电流的傅立叶光谱的峰中获得ABS能级。我们的方案可用于检测具有相等电子孔权重的稳健零能量主要结合状态（MBSS），在可以进行局部隧道光谱测量的候选平台中。在1D Majorana纳米线模型中，我们从数值上计算了不同类型的低能结合状态（包括ABSS，Quasi-MBS和MBS）的电子孔权重。
Andreev bound states (ABSs) are localized quantum states that contain both electron and hole components. They ubiquitously reside in inhomogeneous superconducting systems. Following theoretical analysis, we propose to probe the electron-hole weights of an ABS via a local tunneling measurement that detects the transient current under a steplike pulse bias. With our protocol, the ABS energy level can also be obtained from peaks of the Fourier spectrum of the transient current. Our protocol can be applied to detect robust zero-energy Majorana bound states (MBSs), which have equal electron-hole weights, in candidate platforms where local tunneling spectroscopy measurement is possible. In the 1D Majorana nanowire model, we numerically calculate the electron-hole weights for different types of low-energy bound states, including ABSs, quasi-MBSs, and MBSs.
