Half-metallic semiDirac point generated by quantum confinement in TiO${}_2$/VO${}_2$ 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 {\it half metallic} VO${}_2$ slab within insulating TiO${}_2$ produces an unexpected and unprecendented two-dimensional new state, with a {\it 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.

5 pages, 4 figures

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• Orbital-assisted metal-insulator transition in VO${}_2$
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• Role of electron-electron and electron-phonon interaction effect in the optical conductivity of VO2
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• Photoemission study of TiO2/VO2 interfaces

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