论文标题
磁场上的超导ADATOM层的顺序参数的签名依赖性准粒子干扰
Signatures of the order parameter of a superconducting adatom layer in magnetic field dependent quasiparticle interference
论文作者
论文摘要
实验观察到沉积在半导体底物上的原子薄金属层的超导性。与任何超导体一样，重要的是要确定超导配对函数的结构，以揭示负责超导性的机制。为此，我们研究了二维三角晶格的可能超导状态。我们计算了由各种最近的邻配对顺序参数造成的准粒子干扰（QPI）模式，并显示如何使用QPI来区分这些顺序参数。 QPI模式是真实空间局部密度状态的动量空间表示：动量$ Q $处的QPI信号揭示了在这种动量转移时散射过程的强度。我们展示了来自电荷障碍（即杂质）和订单参数障碍（即涡旋）的散射之间的特征差异如何用于识别超导对的角动量。
Experiments have observed superconductivity in atomically-thin metallic layers deposited on semiconducting substrates. As in any superconductor, it is important to determine the structure of the superconducting pairing function in order to reveal the mechanism responsible for superconductivity. To that end, we study the possible superconducting states of two-dimensional triangular lattices. We calculate the quasiparticle interference (QPI) patterns which would result from various nearest-neighbor pairing order parameters, and show how the QPI can be used to distinguish between those order parameters. The QPI patterns are the momentum-space representations of real-space local density-of-states fluctuations: the QPI signal at momentum $q$ reveals the strength of scattering processes at that momentum transfer. We show how characteristic differences between scattering from charge disorder (i.e. impurities) and from order-parameter disorder (i.e. vortices) can be used to identify the angular momentum of the superconducting pairs.
