论文标题
来自配对密度波不稳定性的列列单一组分超导性和环流顺序
Nematic single-component superconductivity and loop-current order from pair-density wave instability
论文作者
论文摘要
我们研究了具有潜在的成对密度波（PDW）不稳定性的模型中可能出现为残留前体相位的列表和环流类型阶。我们讨论了这样的残留相如何产生高度各向异性的刚度，即具有低固有刚度的共存的单组分超导体，而不足的蛋饼超导体也是如此。接下来，重点关注具有平均野外pdw基态的政权，并具有环流和列表$ xy $（b $ _ {2g} $）订单，我们发现了一个先发制的过渡到一个低和高的遗迹阶段，带有循环和nematorent和nematic order and nematic Order，与$ xy $ _ $ _ $ _ {2G} $ _ {2G} $ （b $ _ {1g} $）对称性。在这两个阶段之间的过渡范围内，出现了一个软列的状态，我们期望在外部田间存在下，列明主管很容易从高对称方向上固定。 Results are discussed in relation to findings in the cuprates, especially to the recently inferred highly anisotropic superconducting fluctuations [Wårdh {\em et al.}, ``Colossal transverse magnetoresistance due to nematic superconducting phase fluctuations in a copper oxide'', arXiv:2203.06769], giving additional evidence for an underlying这些材料中无处不在的PDW不稳定。
We investigate the nematic and loop-current type orders that may arise as vestigial precursor phases in a model with an underlying pair-density wave (PDW) instability. We discuss how such a vestigial phase gives rise to a highly anisotropic stiffness for a coexisting single-component superconductor with low intrinsic stiffness, as is the case for the underdoped cuprate superconductors. Next, focusing on a regime with a mean-field PDW ground state with loop-current and nematic $xy$ (B$_{2g}$) order, we find a preemptive transition into a low and high-temperature vestigial phase with loop-current and nematic order corresponding to $xy$ (B$_{2g}$) and $x^2-y^2$ (B$_{1g}$) symmetry respectively. Near the transition between the two phases, a state of soft nematic order emerges for which we expect that the nematic director is readily pinned away from the high-symmetry directions in the presence of an external field. Results are discussed in relation to findings in the cuprates, especially to the recently inferred highly anisotropic superconducting fluctuations [Wårdh {\em et al.}, ``Colossal transverse magnetoresistance due to nematic superconducting phase fluctuations in a copper oxide'', arXiv:2203.06769], giving additional evidence for an underlying ubiquitous PDW instability in these materials.
