title: Valley-polarized quantum anomalous Hall effect in silicene.
abstract: We find theoretically a new quantum state of matter-the valley-polarized quantum anomalous Hall state in silicene. In the presence of Rashba spin-orbit coupling and an exchange field, silicene hosts a quantum anomalous Hall state with Chern number C=2. We show that through tuning the Rashba spin-orbit coupling, a topological phase transition results in a valley-polarized quantum anomalous Hall state, i.e., a quantum state that exhibits the electronic properties of both the quantum valley Hall state (valley Chern number Cv=3) and quantum anomalous Hall state with C=-1. This finding provides a platform for designing dissipationless valleytronics in a more robust manner.
authors.affiliation: Department of Physics, Beihang University, Beijing 100191, China.
authors.forename: Hui
authors.initials: H
authors.lastname: Pan
authors.affiliation: Department of Physics, Beihang University, Beijing 100191, China.
authors.forename: Zhenshan
authors.initials: Z
authors.lastname: Li
authors.affiliation: School of Physics, Beijing Institute of Technology, Beijing 100081, China.
authors.forename: Cheng-Cheng
authors.initials: CC
authors.lastname: Liu
authors.affiliation: Department of Physics, Heze University, Heze, Shandong 274015, China.
authors.forename: Guobao
authors.initials: G
authors.lastname: Zhu
authors.affiliation: Department of Physics, University of Science and Technology of China, Hefei, Anhui 230026, China and ICQD, Hefei National Laboratory for Physical Sciences at Microscale, University of Science and Technology of China, Hefei, Anhui 230026, China and Department of Physics, The University of Texas at Austin, Austin, Texas 78712, USA.
authors.forename: Zhenhua
authors.initials: Z
authors.lastname: Qiao
authors.affiliation: School of Physics, Beijing Institute of Technology, Beijing 100081, China.
authors.forename: Yugui
authors.initials: Y
authors.lastname: Yao