Half-Metallic Semi-Dirac-Point Generated by Quantum Confinement in TiO2/VO2 Nanostructures

被引：232

作者：

Pardo, Victor ^{[1
,2
]}

Pickett, Warren E. ^{[1
]}

机构：

[1] Univ Calif Davis, Dept Phys, Davis, CA 95616 USA

[2] Univ Santiago de Compostela, Dept Fis Aplicada, E-15782 Santiago De Compostela, Spain

来源：

PHYSICAL REVIEW LETTERS | 2009年 / 102卷 / 16期

关键词：

INSULATOR-TRANSITION; ELECTRON-GAS; BAND THEORY; VO2; GRAPHENE; HUBBARD;

D O I：

10.1103/PhysRevLett.102.166803

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Multilayer VO2/TiO2 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.

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页数：4

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