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