Local study of disordered superconductors

拟议的研究以无序超导体为中心。虽然超导性对大量的无序性不敏感，但很多时候，在这种系统中可以发展出意想不到的颗粒状电子结构，表现出空间变化的超导间隙。最近有报道称，随着无序程度的进一步增加，第二种集体的间隙也会在无序的胶片中出现。根据这些结果，我们开始了几种薄膜超导体的比较局域光谱研究。我们的初步结果表明，在低无序的薄膜中，存在一种控制超导相的潜在秩序。我们还在这些低无序度的薄膜中发现了意想不到的间隙激发。我们提出研究突现有序和不同的隙内状态作为无序程度和薄膜厚度的函数。我们最大的优势在于使用超导尖端提高了分辨率，并获得了各种不同的薄膜，使我们能够研究无序超导体的共同物理性质，而不是专注于依赖样品的细节。

The proposed study centers on disordered superconductors. Although superconductivity is insensitive to enormous amounts of disorder, many times an unexpected granular electronic structure can develop in such systems exhibiting a spatially varying superconducting gap. More recently it was reported that, upon further increase of disorder, a second, collective, gap can also develop in disordered films. Following these results we initiated a comparative local spectroscopy study of several thin-film superconductors. Our initial results suggest the existence of an underlying order governing the superconducting phase in low-disordered films. We also found unforeseen in-gap excitations already in these low-disorder films. We propose to study the emergent order and different in-gap states as a function of disorder level and film thickness. Our great advantage stems from increased resolution using superconducting tips, and access to a variety of different films allowing us to study common physical properties of disordered superconductors rather than focusing on sample dependent details.