arXivDaily arXiv每日学术速递 周一至周五更新
北美退伍军人节(Veterans Day),12 日无更新
arXiv 2009.07957cond-mat.mes-hall
收藏

二维材料中正常-超导体界面处的波包散射:一种推广的理论方法

Wave-packet scattering at a normal-superconductor interface in two-dimensional materials: a generalized theoretical approach

F. J. A. Linard, V. N. Moura, L. Covaci, M. V. Milošević, A. Chaves

摘要:

本文发展了一种基于分裂算符技术的波包时间演化方法,研究了准粒子在任意形状和剖面的正常超导体界面上的散射。作为一个实际应用,我们考虑一个系统,其中低能电子可以被描述为狄拉克粒子,这是大多数二维材料,如石墨烯和过渡金属二硫属化物的情况。然而,该方法很容易适用于其他情况,如电子在几层黑磷,或任何薛定谔准粒子在有效质量近似的半导体。我们采用的方法来重温Andreev反射在石墨烯,镜面反射和逆反射的情况下观察到的电子散射的阶梯状超导区域。打开一个零间隙通道的超导区域上的电子和空穴散射的效果也得到解决,作为这里提出的技术的多功能性的一个例子。

英文摘要:

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.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑