论文标题
电子排斥的配对密度波顺序
Pair density wave order from electron repulsion
论文作者
论文摘要
一对密度波（PDW）是一个超导体，其阶参数是空间的周期性函数，而没有伴随的空间均匀分量。由于PDW并不是费米液体弱偶联不稳定性的结果，因此PDW顺序的通用配对机制仍然难以捉摸。我们描述并解决具有强大PDW阶段的模型。为了访问中间耦合极限，我们调用了Fermi液体的大量$ N $限制，并具有令人反感的BCS相互作用，这些相互作用允许鞍点解决方案。我们表明，远程PDW顺序的要求是，排斥的BCS耦合必须在空间中是非单调的，并且其强度必须超过阈值。我们获得了一个有限温度转换为PDW顺序的相图，并且在发生非fermi液体行为的情况下，$ t = 0 $量子临界点。
A pair density wave (PDW) is a superconductor whose order parameter is a periodic function of space, without an accompanying spatially-uniform component. Since PDWs are not the outcome of a weak-coupling instability of a Fermi liquid, a generic pairing mechanism for PDW order has remained elusive. We describe and solve models having robust PDW phases. To access the intermediate coupling limit, we invoke large $N$ limits of Fermi liquids with repulsive BCS interactions that admit saddle point solutions. We show that the requirements for long range PDW order are that the repulsive BCS couplings must be non-monotonic in space and that their strength must exceed a threshold value. We obtain a phase diagram with both finite temperature transitions to PDW order, and a $T=0$ quantum critical point, where non-Fermi liquid behavior occurs.
