The electronic structure of transition metal oxides featuring correlated electrons can be rationalized within the Zaanen-Sawatzky-Allen framework. Following a brief description of the present paradigms of electronic behavior, we focus on the physics of rare-earth nickelates as an archetype of complexity emerging within the charge transfer regime. The intriguing prospect of realizing the physics of high-Tc cuprates through heterostructuring resulted in a massive endeavor to epitaxially stabilize these materials in ultrathin form. A plethora of new phenomena unfolded in such artificial structures due to the effect of epitaxial strain, quantum confinement, and interfacial charge transfer. Here we review the present status of artificial rare-earth nickelates in an effort to uncover the interconnection between the electronic and magnetic behavior and the underlying crystal structure. We conclude by discussing future directions to disentangle the puzzle regarding the origin of the metal-insulator transition, th...

中文翻译：

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稀土镍酸盐的超薄膜物理和异质结构

具有相关电子的过渡金属氧化物的电子结构可以在 Zaanen-Sawatzky-Allen 框架内合理化。在简要描述当前的电子行为范式之后，我们将重点放在作为电荷转移机制中出现的复杂性原型的稀土镍酸盐的物理学上。通过异质结构实现高 Tc 铜酸盐物理的有趣前景导致了以超薄形式外延稳定这些材料的巨大努力。由于外延应变、量子限制和界面电荷转移的影响，在这种人造结构中出现了大量新现象。在这里，我们回顾了人工稀土镍酸盐的现状，以揭示电子和磁行为与潜在晶体结构之间的相互联系。最后，我们讨论了未来的方向，以解开有关金属-绝缘体转变起源的难题，...