论文标题
由于非局部量子干扰，无限层镍的三维键级不稳定性
Three-dimensional bond-order instability in infinite-layer nickelates due to nonlocal quantum interference
论文作者
论文摘要
最近发现的超导无限层镍镍$ r $ nio $ _2 $（$ r $ = nd，la，pr）吸引了越来越多的关注，这是与丘比特类似的系统。 $ r $ nio $ _2 $和ybco cuprates都显示了带有波矢量$ {\ bf q} \ sim（2π/3,0，q_z）$的三维（3D）CDW，而$ q_z $是非零和不兼容的。在这里，我们揭示了$ r $ nio $ _2 $中的特征CDW自然可以解释为paramagnons之间的量子干扰，通过关注以下特征的以下特征，即$ r $ nio $ _2 $：（i）FERMI表面和（ii）大型自孔（II）大型自孔（$ \ sim 14 $％$ fermi表面和（ii）。该机制预测了$ d_ {x^2-y^2} $ - 次要3D嵌套向量$ {\ bf q}^c \ sim（2π/3,0，q^c_z）$（q^c_z =0.2π\ sim2π/3）$的出现。获得的强键波会导致镍液中的非Fermi液态电子状态和超导状态。
Recently discovered superconducting infinite-layer nickelates $R$NiO$_2$ ($R$=Nd, La, Pr) attracts increasing attention as a similar system to cuprates. Both $R$NiO$_2$ and YBCO cuprates display the three-dimensional (3D) CDW with wave vector ${\bf q}\sim(2π/3,0,q_z)$, while $q_z$ is non-zero and incommensurate in the former system. Here, we reveal that the characteristic CDW in $R$NiO$_2$ can be naturally explained as the quantum interference between paramagnons, by focusing on the following characteristics of $R$NiO$_2$: (i) prominent three-dimensionality in the Fermi surface and (ii) large self-hole-doping ($\sim 14$%). This mechanism predicts the emergence of the $d_{x^2-y^2}$-wave bond order at a secondary 3D nesting vector ${\bf q}^c\sim(2π/3,0,q^c_z)$ $(q^c_z=0.2π\sim 2π/3)$. The obtained strong bond fluctuations lead to the non-Fermi liquid electronic states and superconducting states in nickelates.
