Single-layer intrinsic 2H-phase LuX_(2)(X=Cl,Br,I)with large valley polarization and anomalous valley Hall effect  

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)

机构地区：[1]School of Physics and Technology,University of Jinan,Jinan 250022,China

出　　处：《Chinese Physics B》2023年第3期478-483,共6页中国物理B（英文版）

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).

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.

关 键 词：intrinsic ferrovalley anomalous valley Hall effect first-principles calculations 

分 类 号：O469[理学—凝聚态物理]