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We study the electronic structure of cubic phase uranium dioxide at differentvolumes using a combination of density functional theory and dynamicalmean-field theory. The \emph{ab initio} calculations predict anorbital-selective Mott insulator-metal transition at a moderate pressure of$\approx 45$ GPa. At this pressure the $j=5/2$ states become metallic, whilethe $j=7/2$ states remain insulating up to about 60 GPa. In the metallic state,we observe a rapid decrease of the 5$f$ occupation and total angular momentumwith pressure. Simultaneously, the generalized Zhang-Rice state, which is ofpredominantly $j=5/2$ character, quickly disappears after the transition intothe metallic phase.

Orbital-Selective Mott Transition and Evolution of the Zhang-Rice State in Cubic Phase UO$_{2}$ Under Pressure