二维CrI_(3)晶体的磁性测量与调控  

Probe and manipulation of magnetism of two-dimensional CrI_(3) crystal

作　　者：张颂歌 陈雨彤 王宁[4] 柴扬[3] 龙根 张广宇 Zhang Song-Ge;Chen Yu-Tong;Wang Ning;Chai Yang;Long Gen;Zhang Guang-Yu(Songshan Lake Materials Laboratory,Dongguan 523808,China;Institute of Textiles and Clothing,The Hong Kong Polytechnic University,Hong Kong 999077,China;Department of Applied Physics,The Hong Kong Polytechnic University,Hong Kong 999077,China;Department of Physics,The Hong Kong University of Science and Technology,Hong Kong 999077,China;Institute of Physics,Chinese Academy of Sciences,Beijing National Laboratory for Condensed Matter Physics,School of Physical Sciences,University of Chinese Academy of Sciences,Beijing 100190,China)

机构地区：[1]松山湖材料实验室,东莞523808 [2]香港理工大学纺织及制衣学系,香港999077 [3]香港理工大学应用物理学系,香港999077 [4]香港科技大学物理系,香港999077 [5]中国科学院物理研究所,北京凝聚态物理国家研究中心,中国科学院大学物理科学学院,北京100190

出　　处：《物理学报》2021年第12期264-275,共12页Acta Physica Sinica

基　　金：广东省重点领域研发计划(批准号:2020B0101340001);国家重点研发计划(批准号:2020YFA0309600,2020YFA0309602);香港研究资助局(批准号:CRF-C7036-17W)资助的课题。

摘　　要：长久以来,人们普遍相信低维(三维以下)长程序无法在任何有限的温度下稳定存在.这是因为温度带来的热涨落会破坏由各向同性的短程相互作用支撑的低维体系中对称性破缺的有序态.然而,这个定理同时要求相互作用是短程且各向同性的.事实上很多低维体系是不满足这两个限定条件的.比如二维CrI_(3)晶体中由于强各向异性的存在,其磁子色散关系中有禁带存在.当温度值远远低于该禁带宽度时,磁子无法被温度大规模激发,该二维体系中的长程磁序也就不会被破坏.人们已经利用不同的手段对二维原子层厚度CrI_(3)中的磁序进行了表征,并且做了大量尝试来调控该体系中的磁性结构.本文主要综述了CrI_(3)二维磁性材料的生长、磁性结构测量和磁性结构调控,并对下一阶段的工作从基础凝聚态物理研究以及电子工程应用角度做出展望.For a long time,it has been generally acknowledged that low-dimensional(lower than three-dimensions)long-range orders cannot stay stable at any finite temperature,because temperature-induced fluctuations can destroy any long-range orders in low-dimensional systems supported by isotropic short-range interactions.However,this theorem requires that the interaction must be short-range and isotropic.In fact,many lowdimensional systems do not meet these two requirements.For example,due to the strong anisotropy in twodimensional CrI_(3)crystals,there is a band gap in the magnon spectrum.When the excitation energy from temperature is much lower than the band gap,the magneton cannot be excited by temperature on a large scale,and the long-range magnetic order in the two-dimensional system will not be destroyed.Various methods have been used to characterize the magnetic order in atomically thin CrI_(3)crystals,and a lot of attempts have been made to manipulate the magnetic structure in the system.Focusing on CrI_(3),in this article we review the recent studies on growth,magnetic structure measurement and manipulation of two-dimensional magnetic materials,and also discuss the prospects for the next phase of research from the perspectives of basic condensed matter physics research and electronic engineering applications.

关 键 词：碘化铬 二维磁性材料 磁性测量 磁性调控 

分 类 号：O737[理学—晶体学]