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Influence of quantum confinement and strain on orbital polarization of four-layer<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mi>LaNiO</mml:mi><mml:mn>3</mml:mn></mml:msub></mml:math>superlattices: A DFT+DMFT study
Atomically precise superlattices involving transition-metal oxides provide a unique opportunity to engineer correlated electron physics using strain (modulated by choice of substrate) and quantum confinement (controlled by layer thickness). Here we use the combination of density-functional theory and dynamical mean-field theory (DFT+DMFT) to study $\mathrm{Ni}\phantom{\rule{0.16em}{0ex}}{E}_{g}\phantom{\rule{0.16em}{0ex}}d$-orbital polarization in strained ${\mathrm{LaNiO}}_{3}\text{/}{\mathrm{LaAlO}}_{3}$ superlattices …