论文标题
在非常规超导体的扫描隧道光谱中的Andreev反射
Andreev Reflection in Scanning Tunneling Spectroscopy of Unconventional Superconductors
论文作者
论文摘要
我们评估在STM尖端和具有任意间隙结构的二维（2D）超导体之间的任意电子传输时，在扫描隧道显微镜（STM）设置中测量的差分电导。我们的分析散射理论解释了Andreev的反思，这在更大的传输中变得突出。我们表明，这提供了有关状态隧道密度超出超导间隙结构的补充信息，从而强烈促进了提取间隙对称性及其与基础晶格的关系的能力。我们使用开发的理论讨论有关扭曲双层石墨烯中超导性的最新实验结果。
We evaluate the differential conductance measured in a scanning tunneling microscopy (STM) setting at arbitrary electron transmission between an STM tip and a two-dimensional (2D) superconductor with arbitrary gap structure. Our analytical scattering theory accounts for Andreev reflections, which become prominent at larger transmissions. We show that this provides complementary information about the superconducting gap structure beyond the tunneling density of states, strongly facilitating the ability to extract the gap symmetry and its relation to the underlying crystalline lattice. We use the developed theory to discuss recent experimental results on superconductivity in twisted bilayer graphene.
