论文标题
Weyl超导体中拓扑异常的皮肤效应
Topological Anomalous Skin Effect in Weyl Superconductors
论文作者
论文摘要
我们表明，Weyl超导体可以通过一种新型的表面对粉状机制吸收光，我们将其配音为拓扑异常的皮肤效应。即使在没有障碍的情况下，这也会发生单波形超导体，并通过将希尔伯特空间彻底分解为散装和手性表面的主要州的拓扑分裂来促进。在干净的极限中，该作用表现为由于表面构成转变而引起的特征吸收峰。我们还使用Keldysh响应理论来考虑散装障碍的影响。对于弱疾病，大量反应让人联想到Mattis-Bardeen的结果，$ S $ - 波超导体，尽管存在无间隙的Weyl点，但配对能量的频谱重量强以下是两倍以下。对于更强大的障碍，散装反应变得更像是鲜明的，并且$ p $ - 波的特征消失了。我们表明，在存在弱混乱的情况下与散装结合时，表面式信号可以生存。因此，拓扑异常的皮肤效应可以作为Weyl超导性的指纹。我们还计算了平板几何形状中的Meissner响应，并结合了表面状态的效果。
We show that a Weyl superconductor can absorb light via a novel surface-to-bulk mechanism, which we dub the topological anomalous skin effect. This occurs even in the absence of disorder for a single-band superconductor, and is facilitated by the topological splitting of the Hilbert space into bulk and chiral surface Majorana states. In the clean limit, the effect manifests as a characteristic absorption peak due to surface-bulk transitions. We also consider the effects of bulk disorder, using the Keldysh response theory. For weak disorder, the bulk response is reminiscent of the Mattis-Bardeen result for $s$-wave superconductors, with strongly suppressed spectral weight below twice the pairing energy, despite the presence of gapless Weyl points. For stronger disorder, the bulk response becomes more Drude-like and the $p$-wave features disappear. We show that the surface-bulk signal survives when combined with the bulk in the presence of weak disorder. The topological anomalous skin effect can therefore serve as a fingerprint for Weyl superconductivity. We also compute the Meissner response in the slab geometry, incorporating the effect of the surface states.
