论文标题
扭曲双层石墨烯的配对对称性：一种现象学合成
Pairing symmetry of twisted bilayer graphene: a phenomenological synthesis
论文作者
论文摘要
从实验和理论的角度来看，研究扭曲的双层石墨烯的研究之一是其超导阶段的性质。在这项工作中，我们对现有实验进行了全面的综合，并认为实验约束足以使超导顺序参数的结构几乎独特地确定。特别是，我们认为该顺序参数是节点，并且是由旋转式和旋转三个库珀对的混合物形成的。该论点是基于现象学理由提出的，而无需承诺任何特定的超导体模型。现有数据不足以确定订单参数的轨道均等，这可以是P波或D波。我们提出了一种可以使用Andreev Edge状态测量来区分两者的方法。
One of the outstanding questions in the study of twisted bilayer graphene -- from both experimental and theoretical points of view -- is the nature of its superconducting phase. In this work we perform a comprehensive synthesis of existing experiments, and argue that experimental constraints are strong enough to allow the structure of the superconducting order parameter to be nearly uniquely determined. In particular, we argue that the order parameter is nodal, and is formed from an admixture of spin-singlet and spin-triplet Cooper pairs. This argument is made on phenomenological grounds, without committing to any particular microscopic model of the superconductor. Existing data is insufficient to determine the orbital parity of the order parameter, which could be either p-wave or d-wave. We propose a way in which the measurement of Andreev edge states can be used to distinguish between the two.
