论文标题
二维材料的正常渗透率界面处的波包散射：一种广义的理论方法
Wave-packet scattering at a normal-superconductor interface in two-dimensional materials: a generalized theoretical approach
论文作者
论文摘要
开发了一种基于拆分操纵器技术的波包时间演化方法，以研究在正常驱动器界面的任意曲线和形状的正常驱动器界面上的散射。作为一种实际应用，我们考虑了一个可以将低能电子描述为狄拉克颗粒的系统，对于大多数二维材料，例如石墨烯和过渡金属二甲化剂，这就是这种情况。但是，该方法很容易适用于其他情况，例如在几层黑色磷中的电子，或半导体中有效质量近似中的任何schrödinger准粒子。我们采用了在石墨烯中重新访问Andreev反射的方法，在该石墨烯中，观察到散布阶梯式超导区域的电子的镜面和复古反射案例。还解决了此处提出的技术的多功能性的一个例子，还解决了跨电子和孔散射的零间隙通道的效果。
A wave-packet time evolution method, based on the split-operator technique, is developed to investigate the scattering of quasi-particles at a normal-superconductor interface of arbitrary profile and shape. As a practical application, we consider a system where low energy electrons can be described as Dirac particles, which is the case for most two-dimensional materials, such as graphene and transition metal dichalcogenides. However the method is easily adapted for other cases such as electrons in few layer black phosphorus, or any Schrödinger quasi-particles within the effective mass approximation in semiconductors. We employ the method to revisit Andreev reflection in graphene, where specular and retro reflection cases are observed for electrons scattered by a step-like superconducting region. The effect of opening a zero-gap channel across the superconducting region on the electron and hole scattering is also addressed, as an example of the versatility of the technique proposed here.
