Half-metallic semiDirac point generated by quantum confinement in TiO₂/VO₂ nanostructures

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Multilayer VO₂/TiO₂ nanostructures (d¹ - d⁰ interfaces with no polar discontinuity) are studied with first principles density functional methods including structural relaxation. Quantum confinement of the half metallic VO₂ slab within insulating TiO₂ produces an unexpected and unprecendented two-dimensional new state, with a semiDirac point Fermi surface: spinless charge carriers are effective-mass like along one principal axis, but are massless along the other. Effects of interface imperfection are addressed.