期刊
NANO LETTERS
卷 15, 期 10, 页码 6434-6439出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.5b01791
关键词
Single-spin Dirac state; Chern insulator; CrO2/TiO2 heterostructure; first-principles calculations
类别
资金
- National Science Foundation of China [11374220, 11174009., 11104193]
- China 973 Project [2013CB921900, 2011CBA00109, 2014CB920900]
- Priority Academic Program Development of Jiangsu Higher Education Institutions
- Qinlan project of Jiangsu province
It is highly desirable to combine recent advances in the topological quantum phases with technologically relevant materials. Chromium dioxide (CrO2) is a halfmetallic material, widely used in high-end data storage applications. Using first-principles calculations, we show that a novel class of half semimetallic Dirac electronic phase emerges at the interface CrO2 with TiO2 in both thin film and superlattice configurations, with four spin-polarized Dirac points in momentum-space (k-space) band structure. When the spin and orbital degrees of freedom are allowed to couple, the CrO2/TiO2 superlattice becomes a Chern insulator without external equivalent to 43 K and a Chem number +/- 2, the ensuing quantization of Hall fields or additional doping. With topological gaps conductance to +/- 2e(2)/h will enable potential development of these highly industrialized oxides for applications in topologically high fidelity data storage and energy-efficient electronic and spintronic devices.
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