论文标题
在几乎平坦的多边形超导体中，Bloch量子几何形状促进的对密度波促进
Pair density wave facilitated by Bloch quantum geometry in nearly flat band multiorbital superconductors
论文作者
论文摘要
多功能系统中的Bloch电子具有依赖波形依赖性内膜间混合的量子几何信息特征。几何性质会影响电磁响应，这种效应将延续到超导状态，后者对超流量的重量产生了几何贡献。在本文中，我们表明，在某些适当情况下，这种贡献可能会变得负面。这可能有助于使用真实空间相调制的库珀配对稳定，即配对密度波顺序，正如我们通过两轨模型Bogoliubov de-gennes均值均值计算所证明的那样。因此，量子几何效应构成了在没有外部磁场的情况下形成这种新型物质阶段的固有机制。
Bloch electrons in multiorbital systems carry quantum geometric information characteristic of their wavevector-dependent interorbital mixing. The geometric nature impacts electromagnetic responses, and this effect carries over to the superconducting state, which receives a geometric contribution to the superfluid weight. In this paper, we show that this contribution could become negative under certain appropriate circumstances. This may facilitate the stabilization of Cooper pairings with real space phase modulation, i.e. the pair density wave order, as we demonstrate through two-orbital model Bogoliubov de-Gennes mean-field calculations. The quantum geometric effect therefore constitutes an intrinsic mechanism for the formation of such a novel phase of matter in the absence of external magnetic field.
