论文标题
拓扑$ p_z $ - 波nodal-lin-line超导性超导性与平坦的表面频带在ah $ _ {x} $ cr $ {_ 3} $ as $ {_ 3} $（a = na，k，rb，cs）超导体
Topological $p_z$-wave nodal-line superconductivity with flat surface bands in the AH$_{x}$Cr${_3}$As${_3}$ (A=Na, K, Rb, Cs) superconductors
论文作者
论文摘要
我们将掺杂氢ACR $ _3 $的配对对称性和拓扑特性为$ _3 $超导体。基于我们带有自旋轨耦合（SOC）的第一原则结构，我们构建了配备多轨Hubbard相互作用的现场SOC项，包括现场SOC项。然后，使用随机相位轴测（RPA）方法，我们计算该模型的配对相图。我们的RPA结果在（$ \ left（\ uparrow \ downarrow+\ downarrow \ uparrow \ right \ right）$中产生三胞胎PZ波配对，成为整个实验相关的氢掺杂方案的领先配对对称性。该配对状态属于Spin-U（1） - 对称性受保护的时间反向不变的拓扑结节线超导性。由动量依赖性的拓扑不变Z（KX; KY）确定，整个（001）表面布里鲁因区域覆盖有拓扑平坦带，并带有不同数量的平坦表面带覆盖的不同态度，可以通过扫描隧道显微镜实验来检测到。
We study the pairing symmetry and the topological properties of the hydrogen-doped ACr$_3$As$_3$ superconductors. Based on our first-principle band structure with spin-orbit-coupling (SOC), we construct tight binding model including the on-site SOC terms, equipped with the multi-orbital Hubbard interactions. Then using the random-phase-approximation (RPA) approach, we calculate the pairing phase diagram of this model. Our RPA results yield the triplet pz-wave pairing in the ($\left(\uparrow\downarrow+\downarrow\uparrow\right)$) spin channel to be the leading pairing symmetry all over the experiment relevant hydrogen-doping regimes. This pairing state belongs to the spin-U(1)-symmetry protected time-reversal-invariant topological nodal-line superconductivity. Determined by the momentum-dependent topological invariant Z (kx; ky), the whole (001) surface Brillouin zone is covered with topological flat bands with different regimes covered with different numbers of flat surface bands, which can be detected by the scanning tunneling microscope experiments.
