标题： 电子结构和LaNiO$_2$的超导性质 显示英文标题

标题： Electronic structure and superconducting properties of LaNiO$_2$

摘要： 受对La$_{0.8}$Sr$_{0.2}$NiO$_2$的近期光电子能谱测量的启发，我们利用动力平均场理论和密度矩阵嵌入理论对无限层镍酸盐进行了系统研究。 通过动力平均场计算，在有效两带模型中研究了关联态的重整化电子结构和费米面的La$_{0.8}$Sr$_{0.2}$NiO$_2$。 我们发现关联效应主要体现在Ni$d$带上，这与实验结果一致。 我们进一步通过密度矩阵嵌入理论研究了包括磁性和超导性的基态。 在实验掺杂范围内和刚性带近似下，我们表明$d$波超导性是最低能量状态，而静态磁性除了非常接近零掺杂时外是不存在的。 这些发现为无限层镍酸盐超导性提供了新的理解。 显示英文摘要

摘要： Motivated by recent photoemission measurements on the La$_{0.8}$Sr$_{0.2}$NiO$_2$, we carry out a systematic study of the infinite-layer nickelate using both dynamical mean-field theory and density matrix embedding theory. The renormalized electronic structure and Fermi surface of correlated La$_{0.8}$Sr$_{0.2}$NiO$_2$ are studied in an effective two-band model through the dynamical mean-field calculation. We find the correlation effects reflect mainly on the Ni $d$ band, which is consistent with the experimental findings. We further study the ground state including magnetism and superconductivity through the density matrix embedding theory. Within the experimental doping range and rigid-band approximation, we show that the $d$-wave superconductivity is the lowest energy state, while the static magnetism is absent except very close to zero doping. These findings provide a new understanding of infinite-layer nickelate superconductivity.