Switchable hidden spin polarization and negative Poisson's ratio in two-dimensional antiferroelectric wurtzite crystals  

作　　者：Zhuang Ma Jingwen Jiang Gui Wang Peng Zhang Yiling Sun Zhengfang Qian Jiaxin Zheng Wen Xiong Fei Wang Xiuwen Zhang Pu Huang 

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,Shenzhen 518060,China [2]School of Advanced Materials,Peking University,Shenzhen Graduate School,Shenzhen 518055,China [3]Chongqing Institute of Green and Intelligent Technology,Chinese Academy of Sciences,Chongqing 400714,China [4]School of Physics and Microelectronics,Zhengzhou University,Zhengzhou 450001,China [5]Renewable and Sustainable Energy Institute,University of Colorado,Boulder,Colorado 80309,USA

出　　处：《Journal of Semiconductors》2023年第12期72-80,共9页半导体学报（英文版）

基　　金：supported by Natural Science Foundation of Guangdong Province,China (Grant Nos.2022A1515011990 and 2023A1515030086);National Natural Science Foundation of China (Grant Nos.11774239,11804230 and 61827815);National Key R&D Program of China (Grant No.2019YFB2204500);Shenzhen Science and Technology Innovation Commission (Grant Nos.JCYJ20220531102601004,KQTD20180412181422399 and JCYJ20180507181858539);High-Level University Construction Funds of SZU (Grant Nos.860-000002081209 and 860-000002110711)。

摘　　要：Two-dimensional(2D)antiferroelectric materials have raised great research interest over the last decade.Here,we reveal a type of 2D antiferroelectric(AFE)crystal where the AFE polarization direction can be switched by a certain degree in the 2D plane.Such 2D functional materials are realized by stacking the exfoliated wurtzite(wz)monolayers with“self-healable”nature,which host strongly coupled ferroelasticity/antiferroelectricity and benign stability.The AFE candidates,i.e.,Zn X and Cd X(X=S,Se,Te),are all semiconductors with direct bandgap atΓpoint,which harbors switchable antiferroelectricity and ferroelasticity with low transition barriers,hidden spin polarization,as well as giant in-plane negative Poisson's ratio(NPR),enabling the co-tunability of hidden spin characteristics and auxetic magnitudes via AFE switching.The 2D AFE wz crystals provide a platform to probe the interplay of 2D antiferroelectricity,ferroelasticity,NPR,and spin effects,shedding new light on the rich physics and device design in wz semiconductors.

关 键 词：wurtzite crystal MULTIFERROICS hidden spin polarization negative Poisson's ratio 

分 类 号：O469[理学—凝聚态物理]