title: Half-metallic semi-Dirac-point generated by quantum confinement in TiO2/VO2 nanostructures.
abstract: Multilayer VO_{2}/TiO_{2} nanostructures (d;{1}-d;{0} 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 unprecedented two-dimensional new state, with a (semi-Dirac) 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.
authors.affiliation: Department of Physics, University of California, Davis, California 95616, USA.
authors.forename: Victor
authors.initials: V
authors.lastname: Pardo
authors.forename: Warren E
authors.initials: WE
authors.lastname: Pickett