LaBr_(2)bilayer multiferroic moirésuperlattice with robust magnetoelectric coupling and magnetic bimerons  

作　　者：Wei Sun Wenxuan Wang Hang Li Xiaoning Li Zheyin Yu Ying Bai Guangbiao Zhang Zhenxiang Cheng 

机构地区：[1]International Joint Research Laboratory of New Energy Materials and Devices of Henan Province,School of Physics and Electronics,Henan University,Kaifeng,475004,P.R.China [2]Institute for Superconducting&Electronic Materials,Australian Institute of Innovative Materials,University of Wollongong,Innovation Campus,Squires Way,North Wollongong,NSW,2500,Australia

出　　处：《npj Computational Materials》2022年第1期1515-1523,共9页计算材料学（英文）

基　　金：We acknowledge grants from the National Natural Science Foundation of China under research(Nos.52102238,51571083,and 11674083);Henan University(No.CX3040A0950115,CJ3050A0670499,CJ3050A0670524);H.L.acknowledges the support from the National Natural Science Foundation of China(Grant No.11804078);Henan University(Grant No.CJ3050A0240050);Z.X.C.thanks Australia Research Council for support(DP190100150).

摘　　要：Two-dimensional(2D)van der Waals(vdW)materials provide the versatile playground to stack two or more vdW layers for creation of superior materials with desired properties.Here we theoretically adopt a twisted stack-engineering of two LaBr_(2)monolayers to break space inversion symmetry for ferroelectricity and ultimately multiferroism.The enhancement and reversal of electric polarization are accompanied with the transition from interlayer ferromagnetic and antiferromagnetic orderings,demonstrating an effective magnetoelectric coupling effect with a mechanism dissimilar to that of the conventional multiferroics.Magnetization dynamics simulations show that such magnetic phase transition can excite topologically protected bimeron,and the skyrmion Hall effect can be suppressed by bilayer-bimeron stabilized in both ferromagnetic and antiferromagnetic configurations.Moreover,in the small-angle twisted moirésuperlattice,the uniform polarization will evolve into a staggered domain structure,accompanied with the appearance of bimeron,which forms a significant discrepancy with the non-twisted stack-engineered multiferroic LaBr_(2)bilayer.This work provides a strategy for 2D multiferroic materials by twisted stack engineering of magnetic single layers.

关 键 词：TWISTED COUPLING SUPERLATTICE 

分 类 号：O48[理学—固体物理]