Linear dichroism and polarization controllable persistent spin helix in two-dimensional ferroelectric ZrOI_(2) monolayer  

作　　者：Niuzhuang Yang Gaoyang Gou Xiaoli Lu Yue Hao 

机构地区：[1]School of Microelectronics,State Key Discipline Laboratory of Wide Bandgap Semiconductor Technology,Xidian University,Xi’an 710071,China [2]Frontier Institute of Science and Technology,Xi’an Jiaotong University,Xi’an 710049,China [3]Collaborative Innovation Center of Quantum Information of Shaanxi Province,Xidian University,Xi’an 710071,China

出　　处：《Nano Research》2022年第7期6779-6789,共11页纳米研究（英文版）

基　　金：Authors acknowledge the funding support from the National Science Foundation of China(No.11574244);the Fundamental Research Funds for the Central Universities(No.xzy012020004);supported by funding from the Natural Science Foundation of China(No.61974113);the National Key Research and Development Project(No.2018YFB2202800).The National Supercomputer Center(NSCC)in Tianjin is acknowledged for computational support.

摘　　要：Two-dimensional ferroelectric(2D-FE)materials that characterize the spontaneous ferroelectricity down to monolayer limit and rich ferroic properties arising from FE orderings,have been extensively explored as low-dimensional sensor,electric and memory devices.In current work,group-IV transition metal oxide dihalide MOX_(2)(M=Zr and Hf,X=Cl,Br and I)monolayers have been identified as a new group of 2D-FE materials.Using the comprehensive first-principles calculations combined with finite temperature Monte Carlo(MC)and ab initio molecular dynamics(MD)simulations,we investigate the temperature stability of FE polarization and further uncover the unique properties associated with spontaneous ferroelectricity of MOX_(2) monolayers.In particular,ZrOI_(2) monolayer,a promising 2D-FE material with room temperature stable ferroelectricity,semiconducting electronic structure and optoelectronic response under visible light,offers an ideal material platform to investigate the coupling of intrinsic anisotropy,optical absorption selectivity and spin degree of freedom with 2D ferroelectricity.Typically,significant optical absorption anisotropy and giant linear dichroism effect are predicted for a 2D optical polarizer device based on ZrOI_(2) monolayer,where the adsorption of incident monochromatic linearly polarized light(hv=3.23 eV)along two planar directions with a nearly 100%optical selectivity can be achieved.Moreover,the spin–orbit coupling(SOC)induced spin splitting of valence band edges and out-of-plane textured spin configuration occur in ZrOI_(2) monolayer.In the meanwhile,the unidirectional spin–orbit field protected by C2v wave-vector point group can further create the persistent spin helix(PSH)state,leading to the extraordinarily long spin carrier lifetime.More importantly,the nonvolatile control of PSH state via the electric field induced polarization reversal has also been demonstrated for FE-ZrOI_(2) monolayer,which manifests as a great advantage for applications of ZrOI_(2) as the lowdimensional spin-field e

关 键 词：two-dimensional ferroelectricity first-principles calculations optical absorption anisotropy spin-textured ferroelectrics allelectric spintronics 

分 类 号：TN304[电子电信—物理电子学] TB3[一般工业技术—材料科学与工程]