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Using first principles calculations, we determined the epitaxial-straindependence of the ground state of the 1:1 SrCrO$_3$/SrTiO$_3$ superlattice. Thesuperlattice layering leads to significant changes in the electronic statesnear the Fermi level, derived from Cr $t_{2g}$ orbitals. An insulating phase isfound when the tensile strain is greater than 2.2\% relative to unstrainedcubic SrTiO$_3$. The insulating character is shown to arise from Cr $t_{2g}$orbital ordering, which is produced by an in-plane polar distortion thatcouples to the superlattice d-bands and is stabilized by epitaxial strain. Thiseffect can be used to engineer the band structure near the Fermi level intransition metal oxide superlattices.

Coupled nonpolar-polar metal-insulator transition in 1:1 SrCrO$_3$/SrTiO$_3$ superlattices: A first-principles study