Multiferroicity and giant in-plane negative Poisson’s ratio in wurtzite monolayers  

作　　者：Zhuang Ma Pu Huang Jin Li Peng Zhang Jiaxin Zheng Wen Xiong Fei Wang Xiuwen Zhang 

机构地区：[1]Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province,College of Physics and Optoelectronic Engineering,Shenzhen University,518060,Shenzhen,China [2]School of Advanced Materials,Peking University,Shenzhen Graduate School,518055,Shenzhen,China [3]Chongqing Institute of Green and Intelligent Technology,Chinese Academy of Sciences,400714,Chongqing,China [4]School of Physics and Microelectronics,Zhengzhou University,450001,Zhengzhou,China

出　　处：《npj Computational Materials》2022年第1期489-499,共11页计算材料学（英文）

基　　金：This work is supported by National Natural Science Foundation of China(Grant Nos.11804230,11774239,61827815);Shenzhen Science and Technology Innovation Commission(Grant Nos.KQTD20170810105439418,KQTD20180412181422399,JCYJ20180507181858539,ZDSYS201707271554071);High-Level University Construction Funds of SZU(Grant No.860-000002081209 and 860-000002110711).

摘　　要：Monolayers of layered materials,such as graphite and molybdenum dichalcogenides,have been the focus of materials science in the last decades.Here,we reveal benign stability and intriguing physical properties in the thinnest monolayer wurtzite(wz)semiconductors,which can be exfoliated from their bulk and stacked to reform the wz crystals.The candidate ZnX and CdX(X=S,Se,Te)monolayers possess low cleavage energy and direct bandgaps,which harbor strongly coupled ferroelectricity and ferroelasticity with low transition barriers,giant in-plane negative Poisson’s ratio,as well as giant Rashba spin splitting,enabling the co-tunability of spin splitting and auxetic magnitudes via multiferroic switching.These wz monolayers can be used as building blocks of devices structures,due to their inherent“self-healable”capacity,which offer more flexibility for semiconductor fabrication and provide a natural platform to probe the interplay of multiple physical effects,bringing light into the rich physics in tetrahedral semiconductors.

关 键 词：PLANE SPLITTING MOLYBDENUM 

分 类 号：O34[理学—固体力学]