Non-synchronous bulk photovoltaic effect in two-dimensional interlayer-sliding ferroelectrics

作     者：Rui-Chun Xiao Yang Gao Hua Jiang Wei Gan Changjin Zhang Hui Li 

作者机构：Institute of Physical Science and Information Technology and Information Materials and Intelligent Sensing Laboratory of Anhui ProvinceAnhui UniversityHefei230601China Department of PhysicsUniversity of Science and Technology of ChinaHefei230026China School of Physical Science and TechnologySoochow UniversitySuzhou215006China High Magnetic Field LaboratoryChinese Academy of SciencesHefei230031China 

出 版 物：《npj Computational Materials》 (计算材料学（英文）)

年 卷 期：2022年第8卷第1期

页      面：1328-1335页

核心收录：

学科分类：080901[工学-物理电子学] 0809[工学-电子科学与技术（可授工学、理学学位）] 08[工学] 080401[工学-精密仪器及机械] 0804[工学-仪器科学与技术] 0803[工学-光学工程] 

基　　金：This work is supported by the National Natural Science Foundation of China under No.11947212 Natural Science Foundation of Anhui Province under No.110158162022 in part by the Joint Funds of the National Natural Science Foundation of China and the Chinese Academy of Sciences Large-Scale Scientific Facility under Grant No.U1932156 in part by the Natural Science Foundation of Anhui Province under Grant No.2008085QA29 Y.G.and R.-C.X.acknowledge the startup foundation from USTC and AHU,respectively 

主　　题：polarization ferroelectric interlayer 

摘      要：Spontaneous polarization and bulk photovoltaic effect(BPVE)are two concomitant physical properties in ferroelectric *** flipping of ferroelectric order usually accompanies the switching of BPVE in all directions because both of them are reversed under the inversion *** this study,we report the non-synchronous BPVE in two-dimensional(2D)interlayer-sliding ferroelectric materials featuring unswitchable in-plane BPVE(light-induced photocurrent in the xy plane)and switchable out-of-plane BPVE(light-induced polarization along the z-direction).Symmetry analysis within the abstract bilayer crystal model and first-principles calculations validate these BPVE *** is because the positive and negative ferroelectric states caused by interlayer sliding are related by mirror symmetry which cannot flip all the BPVE tensor *** finding extends the understanding of the relationship between ferroelectricity and *** one hand,the switchable out-of-plane BPVE can be used to design switchable photoelectric *** the other hand,the in-plane BPVE is robust against the ferroelectric flipping,and the unswitchable character is beneficial to construct larger-scale photoelectric devices.