Two-Dimensional MnO2/Graphene Interface: Half-Metallicity and Quantum Anomalous Hall State

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• 作者：Li-Yong Gan ; Qingyun Zhang ; Chun-Sheng Guo ; Udo Schwingenschl?gl ; Yong Zhao
• 刊名：Journal of Physical Chemistry C
• 出版年：2016
• 出版时间：February 4, 2016
• 年：2016
• 卷：120
• 期：4
• 页码：2119-2125
• 全文大小：662K
• ISSN：1932-7455

文摘

We explore the electronic properties of the MnO₂/graphene interface by first-principles calculations, showing that MnO₂ becomes half-metallic. MnO₂ in the MnO₂/graphene/MnO₂ system provides time-reversal and inversion symmetry breaking. Spin splitting by proximity occurs at the Dirac points and a topologically nontrivial band gap is opened, enabling a quantum anomalous Hall state. The half-metallicity, spin splitting, and size of the band gap depend on the interfacial interaction, which can be tuned by strain engineering.