摘要
Manipulation of the valley degree of freedom provides a new path for quantum information technology,but the real intrinsic large valley-polarization materials are rarely reported up to date.Here,we perform first-principles calculations to predict a class of 2H-phase single layer(SL)materials LuX_(2)(X=Cl,Br,I)to be ideal candidates.SL-Lu X_(2)are ferrovalley materials with a giant valley-polarization of 55 meV–148 meV as a result of its large spin–orbital coupling(SOC)and intrinsic ferromagnetism(FM).The magnetic transition temperatures of SL-LuI_(2)and SL-LuCl2are estimated to be 89 K–124 K,with a sizable magnetic anisotropy at out-of-plane direction.Remarkably,the anomalous valley Hall effect(AVHE)can be controlled in SL-LuX_(2)when an external electric field is applied.Moreover,the intrinsic valleypolarization of SL-LuI_(2)is highly robust for biaxial strain.These findings provide a promising ferrovalley material system for the experimentation of valleytronics and subsequent applications.
作者
胡春生
仵允京
刘元硕
傅帅
崔晓宁
王易昊
张昌文
Chun-Sheng Hu;Yun-Jing Wu;Yuan-Shuo Liu;Shuai Fu;Xiao-Ning Cui;Yi-Hao Wang;Chang-Wen Zhang(School of Physics and Technology,University of Jinan,Jinan 250022,China)
基金
the Taishan Scholar Program of Shandong Province,China(Grant No.ts20190939)
the Independent Cultivation Program of Innovation Team of Jinan City(Grant No.2021GXRC043)
the National Natural Science Foundation of China(Grant No.52173283).