论文标题
表征两轨$ d $ - $ s $型号的超导不稳定：无限镍镍超导体的见解
Characterizing the superconducting instability in a two-orbital $d$-$s$ model: insights to infinite-layer nickelate superconductors
论文作者
论文摘要
由于最近实现了无限层镍超导性（SC）的动机，我们通过动态群集量蒙特卡洛计算进行了定量研究两轨$ d $ d $ s $ s $模型。我们的模拟着重于轨道间杂交对超导性能的影响，表明$ d $ - $ s $ s $杂交强度在抑制$ d $ - 波配对中与无限层镍相关的兴奋剂配对具有决定性的作用。尽管我们在弱杂交时确认单轨道描述，但在相对较大的杂交中，存在非限制有限的$ s $ sumbital占用率对抑制超导性抑制的建设性效应。更引人注目的是，在大型$ D $ -S $杂交中，可能会在足够大的Hubbard互动中提高SC。我们进一步提供了一些关于$ d $ -s $ s $型号与无限层镍甲甲酸盐的相关性的见解。
Motivated by the recent realization of the infinite-layer nickelate superconductivity (SC), we quantitatively investigate a two-orbital $d$-$s$ model by dynamic cluster quantum Monte Carlo calculations. Focusing on the impact of inter-orbital hybridization on the superconducting properties, our simulations indicate that the $d$-$s$ hybridization strength has a decisive role in the suppression of the $d$-wave pairing in the doping regime relevant to infinite-layer nickelates. Although we confirm on the single-orbital description at weak hybridization, at relatively large hybridization, there exists a constructive effect of the non-negligibly finite $s$ orbital occupancy on inhibiting the suppression of the superconductivity. More strikingly, there exists a possible SC enhancement at large enough Hubbard interaction via large $d$-$s$ hybridization. We further provide some insights on the relevance of $d$-$s$ model to infinite-layer nickelates.
