title: Electrically tunable multiple Dirac cones in thin films of the (LaO)2(SbSe2)2 family of materials.
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.
authors.affiliation: Department of Physics and State Key Laboratory of Low-Dimensional Quantum Physics, Tsinghua University, Beijing 100084, China.|Department of Physics, The Pennsylvania State University, University Park, State College, Pennsylvania 16802-6300, USA.
authors.forename: Xiao-Yu
authors.initials: XY
authors.lastname: Dong
authors.affiliation: Department of Physics and State Key Laboratory of Low-Dimensional Quantum Physics, Tsinghua University, Beijing 100084, China.|Department of Physics, The Pennsylvania State University, University Park, State College, Pennsylvania 16802-6300, USA.
authors.forename: Jian-Feng
authors.initials: JF
authors.lastname: Wang
authors.affiliation: Department of Physics, The Pennsylvania State University, University Park, State College, Pennsylvania 16802-6300, USA.
authors.forename: Rui-Xing
authors.initials: RX
authors.lastname: Zhang
authors.affiliation: Department of Physics and State Key Laboratory of Low-Dimensional Quantum Physics, Tsinghua University, Beijing 100084, China.
authors.forename: Wen-Hui
authors.initials: WH
authors.lastname: Duan
authors.affiliation: Department of Physics and State Key Laboratory of Low-Dimensional Quantum Physics, Tsinghua University, Beijing 100084, China.
authors.forename: Bang-Fen
authors.initials: BF
authors.lastname: Zhu
authors.affiliation: Department of Physics, The Pennsylvania State University, University Park, State College, Pennsylvania 16802-6300, USA.
authors.forename: Jorge O
authors.initials: JO
authors.lastname: Sofo
authors.affiliation: Department of Physics, The Pennsylvania State University, University Park, State College, Pennsylvania 16802-6300, USA.
authors.forename: Chao-Xing
authors.initials: CX
authors.lastname: Liu