Valley-polarized quantum anomalous Hall phases and tunable topological phase transitions in half-hydrogenated Bi honeycomb monolayers
Valley-polarized quantum anomalous Hall phases and tunable topological phase transitions in half-hydrogenated Bi honeycomb monolayers
复制标题
半氢化Bi蜂窝单层中的谷偏振量子反常霍尔相和可调谐拓扑相变
DOI：
10.1103/physrevb.91.165430
复制
发表时间：
2015-04-27
影响因子：
3.7
通讯作者：
Yao, Yugui
中科院分区：
文献类型：
--
作者：
Liu, Cheng-Cheng;Zhou, Jin-Jian;Yao, Yugui
Based on first-principles calculations, we find novel valley-polarized quantum anomalous Hall (VP-QAH) phases with a large gap-0.19 eV at an appropriate buckled angle and tunable topological phase transitions driven by the spontaneous magnetization within a half-hydrogenated Bi honeycomb monolayer. Depending on the magnetization orientation, four different phases can emerge, i.e., two VP-QAH phases, ferromagnetic insulating, and metallic states. When the magnetization is reversed from the +z to the -z directions, accompanied with a sign change in the Chern number (from -1 to +1), the chiral edge state is moved from valley K to K'. Our findings provide a platform for designing dissipationless electronics and valleytronics in a more robust manner through the tuning of the magnetization orientation.
