二维本征铁电体及其多铁耦合的研究进展  

Recent research progress of two-dimensional intrinsic ferroelectrics and their multiferroic coupling

作　　者：叶倩[1] 沈阳 袁野 赵祎峰 段纯刚[1,2] Ye Qian;Shen Yang;Yuan Ye;Zhao Yi-Feng;Duan Chun-Gang(Key Laboratory of Polarized Materials and Devices of Ministry of Education,School of Physics and Electronic Science,East China Normal University,Shanghai 200241,China;Collaborative Innovation Center of Extreme Optics,Shanxi University,Taiyuan 030006,China)

机构地区：[1]华东师范大学物理与电子科学学院,极化材料与器件教育部重点实验室,上海200241 [2]山西大学,极端光学协同创新中心,太原030006

出　　处：《物理学报》2020年第21期307-321,共15页Acta Physica Sinica

基　　金：国家重点研发计划(批准号:2017YFA0303403);上海市科技创新行动计划(批准号:19JC1416700);国家自然科学基金(批准号:11774092)资助的课题.

摘　　要：铁电材料因其具有可被外场调控的电极化状态,以及在传感器、光电器件和信息存储器件中具有潜在应用前景,所以一直以来都是凝聚态物理领域的研究热点.随着微电子集成技术的飞速发展,电子器件日益趋于微型化、集成化和多功能化.传统块体铁电材料因受尺寸效应、界面效应等因素影响,难以满足此发展需求,因而低维铁电材料引起了学术界的广泛关注.近年来,实验上已成功制备出稳定的室温二维铁电材料,第一性原理计算等理论方法对新材料的预测和设计也促进了二维铁电材料的发展.同时,利用二维铁电性与铁谷性、磁性的多铁耦合效应,可以实现电控谷极化、电控磁性等调控机制.多重自由度的相互耦合,会产生如能谷间圆(线)偏振光学选择性、量子自旋霍尔效应等奇异物理特性,对于自旋电子学、谷电子学及光学的发展具有重大的意义.本文首先介绍近年来新型二维铁电材料在理论和实验方面的研究进展,以及二维铁电材料在铁电隧道结、铁电二极管等二维铁电器件中的应用.其次阐述了二维电控铁谷性和电控磁性的多铁耦合效应及其衍生出的新物理现象和机制.最后对二维铁电材料和其他物理性质耦合所具有的丰富物理内涵和广阔应用前景,进行了分析与探讨.Ferroelectric materials have become a research focus of condensed matter physics because of their electric polarization state which can be regulated by external field and has potential applications in sensors,optoelectronic devices and information memory devices.With the rapid development of microelectronic integration technology,electronic devices are becoming more and more miniaturized,integrated and multifunctional.Due to the size effect and interface effect,the traditional bulk ferroelectric materials are difficult to meet the requirements for this development.Therefore,low-dimensional ferroelectric materials have received extensive attention of the academic circle.In recent years,stable room temperature intrinsic twodimensional ferroelectric materials have been successfully prepared.The prediction and design of new materials in theoretical method such as first principles calculation also promote the development of two-dimensional ferroelectric materials.At the same time,the multiferroic coupling effect of two-dimensional ferroelectricity,ferrovalley and magnetism can be used to realize the electronic valley polarization,electronic magnetic control and other regulatory mechanisms.The coupling of multiple degrees of freedom will produce strange physical properties such as optical selectivity of circular(linear)polarization between energy valleys and quantum spin Hall effect,which is of great significance for developing spintronics,valley electronics and optics.In this paper,the recent progress of theoretical and experimental research of new two-dimensional ferroelectric materials is introduced,and the applications of two-dimensional ferroelectric materials in two-dimensional ferroelectric devices such as ferroelectric tunnel junctions and ferroelectric diodes are presented.Secondly,the multiferroic coupling effect of two-dimensional electrically controlled ferroelectric valley and electronically controlled magnetism and their derived new physical phenomena and mechanisms are described.Finally,the rich physical

关 键 词：二维铁电材料 二维铁电器件 多铁耦合 第一性原理计算 

分 类 号：O469[理学—凝聚态物理] TM221[理学—电子物理学]