Electrically tunable multiple Dirac cones in thin films of the (LaO)2(SbSe2)2 family of materials

Xiao-Yu Dong, Jian-Feng Wang, Rui-Xing Zhang, Wen-Hui Duan, Bang-Fen Zhu, Jorge O. Sofo and Chao-Xing Liu ()
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Xiao-Yu Dong: Tsinghua University
Jian-Feng Wang: Tsinghua University
Rui-Xing Zhang: The Pennsylvania State University, University Park, State College, Pennsylvania 16802-6300, USA
Wen-Hui Duan: Tsinghua University
Bang-Fen Zhu: Tsinghua University
Jorge O. Sofo: The Pennsylvania State University, University Park, State College, Pennsylvania 16802-6300, USA
Chao-Xing Liu: The Pennsylvania State University, University Park, State College, Pennsylvania 16802-6300, USA

Nature Communications, 2015, vol. 6, issue 1, 1-7

Abstract: Abstract Two-dimensional Dirac physics has aroused great interests in condensed matter physics ever since the discovery of graphene and topological insulators. The ability to control the properties of Dirac cones, such as bandgap and Fermi velocity, is essential for various new phenomena and the next-generation electronic devices. On the basis of first-principles calculations and an analytical effective model, we propose a new Dirac system with eight Dirac cones in thin films of the (LaO)2(SbSe2)2 family of materials, which has the advantage in its tunability: the existence of gapless Dirac cones, their positions, Fermi velocities and anisotropy all can be controlled by an experimentally feasible electric field. We identify layer-dependent spin texture induced by spin–orbit coupling as the underlying physical reason for electrical tunability of this system. Furthermore, the electrically tunable quantum anomalous Hall effect with a high Chern number can be realized by introducing magnetization into this system.

Date: 2015
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DOI: 10.1038/ncomms9517

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