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Modeling tunneling for the unconventional superconducting proximity effect

机译：用于非传统超导邻近效应的隧穿隧道

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摘要

Recently there has been reinvigorated interest in the superconducting proximity effect, driven by predictions of the emergence of Majorana fermions. To help guide this search, we have developed a phenomenological model for the tunneling spectra in anisotropic superconductor-normal metal proximity devices. We combine successful approaches used in s-wave proximity and standard d-wave tunneling to reproduce tunneling spectra in d-wave proximity devices, and clarify the origin of various features. Different variations of the pair potential are considered, resulting from the proximity-induced superconductivity. Furthermore, the effective pair potential felt by the quasiparticles is momentum-dependent in contrast to s-wave superconductors. The probabilities of reflection and transmission are calculated by solving the Bogoliubov equations. Our results are consistent with experimental observations of the unconventional proximity effect and provide important experimental parameters such as the size and length scale of the proximity induced gap, as well as the conditions needed to observe the reduced and full superconducting gaps.
机译：最近，通过预测Majorana Fermions的预测，在超导邻近效应上进行了重复的兴趣。为了帮助指导该搜索，我们已经开发了各向异性超导体 - 正常金属邻近装置中的隧道光谱的现象学模型。我们将在S波接近和标准D波隧道中使用的成功方法结合在D波接近设备中再现隧道光谱，并阐明各种特征的起源。考虑了对对电位的不同变化，由邻近诱导的超导导致导致。此外，与S波超导体相比，Quasipartics的有效对电位毡是血管依赖性的。通过求解Bogoliubov方程来计算反射和传输的概率。我们的结果与对非常规接近效果的实验观察结果，并提供了重要的实验参数，例如邻近诱导的间隙的尺寸和长度，以及观察降低和完全超导间隙所需的条件。

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