论文标题
超电流引起的异常热厅效应，作为超导差距各向异性的新探针
Supercurrent-induced Anomalous Thermal Hall Effect as a New Probe to Superconducting Gap Anisotropy
论文作者
论文摘要
二维超导体已经在各种原子薄膜（例如扭曲的双层石墨烯）中实现，其中一些预计会涉及非常规的配对机制。由于其较低的维度，这些系统中超导性的确切性质的实验探针受到限制。我们提出，通过将\ emph {垂直}超电流应用于双层超导体，在该双层超导体中，镜子对称自然会被扭曲破坏，因此超循环会引起异常的热厅效应，可作为\ emph {insph {in-plane} in-plane} anisotrapy os of suppercorpoction hymph of the Supercurrent造成的异常热厅效应。这种效果发生在外部磁场的\ emph {缺失}中，并在基态下的时间反转对称性自发断裂。我们为诱导的霍尔电导率提供了明确的公式，并在已经观察到单层超导率的扭曲蛋饼和扭曲的FESE的例子中表明它们很重要。尽管仍然存在技术挑战，但我们认为这是扭曲的双层超导体中差距各向异性的通用探测。
Two-dimensional superconductors have been realized in various atomically thin films such as the twisted bilayer graphene, some of which are anticipated to involve unconventional pairing mechanism. Due to their low dimensionality, experimental probes of the exact nature of superconductivity in these systems have been limited. We propose, by applying a \emph{vertical} supercurrent to a bilayer superconductor where the mirror symmetry is naturally broken by the twisting, there will be anomalous thermal Hall effect induced by the supercurrent that can serve as a sharp probe for the \emph{in-plane} anisotropy of the superconducting gap function. This effect occurs in the \emph{absence} of an external magnetic field and spontaneous breaking of the time-reversal symmetry in the ground state. We derive explicit formulas for the induced thermal Hall conductivity and show them to be significant in the examples of twisted cuprates and twisted FeSe where monolayer superconductivity have already been observed. Though technical challenges still exist, we propose this to be a generic probe of the gap anisotropy in a twisted bilayer superconductor.
