论文标题
kagome金属中的轨道电流和超导率相互交织
Intertwining orbital current order and superconductivity in Kagome metal
论文作者
论文摘要
在新发现的kagome材料中,超导性的性质,$ \ text {av} _3 \ text {sb} _5 $(a = k,rb,cs)一直是激烈辩论的主题。最近的实验表明,电荷密度波(CDW)和超导性的轨道电流顺序存在。由于轨道电流顺序会破坏时间反向对称性,因此它可能从根本上影响可能的超导状态。在这项工作中,我们研究了具有特征性的van Hove奇异性(VHS)的Kagome金属中轨道电流顺序和超导性之间的相互影响。通过明确推导Landau-Ginzburg理论,我们将可能的轨道电流顺序和超导性分类。事实证明,根据轨道电流订购类型,预计有明显的非常规超导性。因此,当确定轨道电流顺序时,可以使用此信息来推断超导顺序参数,反之亦然。我们还讨论了可能区分与轨道电流顺序共存的这种超导状态的可能实验。
The nature of superconductivity in newly discovered Kagome materials, $\text{AV}_3\text{Sb}_5$ (A=K, Rb, Cs), has been a subject of intense debate. Recent experiments suggest the presence of orbital current order on top of the charge density wave (CDW) and superconductivity. Since the orbital current order breaks time-reversal symmetry, it may fundamentally affect possible superconducting states. In this work, we investigate the mutual influence between the orbital current order and superconductivity in Kagome metal with characteristic van Hove singularity (vHS). By explicitly deriving the Landau-Ginzburg theory, we classify possible orbital current order and superconductivity. It turns out that distinct unconventional superconductivities are expected, depending on the orbital current ordering types. Thus, this information can be used to infer the superconducting order parameter when the orbital current order is identified and vice versa. We also discuss possible experiments that may distinguish such superconducting states coexisting with the orbital current order.