Ferroelectricity and Large Rashba Splitting in Two-Dimensional Tellurium  

作　　者：王垚 雷珍珍 张金森 陶新永 华陈强 陆赟豪 Yao Wang;Zhenzhen Lei;Jinsen Zhang;Xinyong Tao;Chenqiang Hua;Yunhao Lu(College of Materials Science and Engineering,Zhejiang University of Technology,Hangzhou 310014,China;Moganshan Research Institute at Deqing County Zhejiang University of Technology,Huzhou 313000,China;School of Physics,Zhejiang University,Hangzhou 310027,China;Zhongfa Aviation Institute of Beihang University,Hangzhou 311115,China)

机构地区：[1]College of Materials Science and Engineering,Zhejiang University of Technology,Hangzhou 310014,China [2]Moganshan Research Institute at Deqing County Zhejiang University of Technology,Huzhou 313000,China [3]School of Physics,Zhejiang University,Hangzhou 310027,China [4]Zhongfa Aviation Institute of Beihang University,Hangzhou 311115,China

出　　处：《Chinese Physics Letters》2023年第11期86-92,共7页中国物理快报（英文版）

基　　金：supported by the National Natural Science Foundation of China(Grant Nos.11904317 and 12204029);the Funding of Leading Innovative and Entrepreneur Team Introduction Program of Zhejiang(Grant No.2020R01002);the Natural Science Foundation of Zhejiang Province(Grant Nos.LY23E020010 and LQ23A040013)。

摘　　要：Two-dimensional(2D)ferroelectric(FE)systems are promising candidates for non-volatile nanodevices.Previous studies mainly focused on 2D compounds.Though counter-intuitive,here we propose several new phases of tellurium with(anti)ferroelectricity.Two-dimensional films can be viewed as a collection of one-dimensional chains,and lone-pair instability is responsible for the(anti)ferroelectricity.The total polarization is determined to be 0.34×10^(-10)C/m for the FE ground state.Due to the local polarization field in the FE film,we show a large Rashba splitting(α_(R)~2 eV·?)with nonzero spin Hall conductivity for experimental detection.Furthermore,a dipole-like distribution of Berry curvature is verified,which may facilitate a nonlinear Hall effect.Because Rashba-splitting/Berry-curvature distributions are fully coupled with a polarization field,they can be reversed through FE phase transition.Our results not only broaden the elemental FE materials,but also shed light on their intriguing transport phenomena.

关 键 词：transition FERROELECTRIC CURVATURE 

分 类 号：O469[理学—凝聚态物理]