Effects of spin-orbit interaction and electron correlations in strontium titanate

We show that the Bloch states in the conduction band of $\mathrm{Sr}\mathrm{Ti}{\mathrm{O}}₃$ arise from the interplay between highly anisotropic hopping in subbands derived from the Ti ${t}_2g$ orbitals and spin-orbit coupling that mixes these orbitals. Because of the nearly flat-band characteristics for one of the principal axes, at sufficiently high doping these Bloch states become unstable with respect to electron interactions, resulting in Mott-like singlet correlations. These findings may be relevant to the anomalous electronic properties of $\mathrm{Sr}\mathrm{Ti}{\mathrm{O}}₃$, including its unusual superconductivity.