论文标题
轨道选择性超导性超导性无限镍镍模型
Orbital Selective Superconductivity in a Two-band Model of Infinite-Layer Nickelates
论文作者
论文摘要
在本研究中，我们在NDNIO $ _2 $和LANIO $ _2 $中探索超导性，采用第一原理派生的低功能模型hamiltonian，由两个轨道组成：Ni $ X^{2} $ - $ y^{2} $，以及一个{\ it Axial axial} and axial} orbital。 {\ it Axial}轨道是由ND/LA $ D $，Ni 3 $ Z^{2} $ - $ R^{2} $和Ni $ S $字符构造的。超导配对对称性和自旋 - 裂开介导的配对相互作用的配对特征值的计算强调了轨道间哈伯德相互作用在超导性中的关键作用，事实证明这是轨道选择性的。轴向轨道带来了问题的材料依赖性，使NDNIO $ _2 $与LANIO $ _2 $不同，从而控制了轨道间的哈伯德相互作用辅助超导性。
In the present study, we explore superconductivity in NdNiO$_2$ and LaNiO$_2$ employing a first-principles derived low-energy model Hamiltonian, consisting of two orbitals: Ni $x^{2}$-$y^{2}$, and an {\it axial} orbital. The {\it axial} orbital is constructed out of Nd/La $d$, Ni 3$z^{2}$-$r^{2}$ and Ni $s$ characters. Calculation of the superconducting pairing symmetry and pairing eigenvalue of the spin-fluctuation mediated pairing interaction underlines the crucial role of inter-orbital Hubbard interaction in superconductivity, which turns out to be orbital-selective. The axial orbital brings in materials dependence in the problem, making NdNiO$_2$ different from LaNiO$_2$, thereby controlling the inter-orbital Hubbard interaction assisted superconductivity.
