Coupled Ferroelectricity and Correlated States in a Twisted Quadrilayer MoS_(2) Moiré Superlattice  

作　　者：吴帆帆 李璐 徐巧玲 刘乐 袁亚龙 赵交交 黄智恒 昝晓洲 Kenji Watanabe Takashi Taniguchi 时东霞 冼乐德 杨威 杜罗军 张广宇 Fanfan Wu;Lu Li;Qiaoling Xu;Le Liu;Yalong Yuan;Jiaojiao Zhao;Zhiheng Huang;Xiaozhou Zan;Kenji Watanabe;Takashi Taniguchi;Dongxia Shi;Lede Xian;Wei Yang;Luojun Du;Guangyu Zhang(Beijing National Laboratory for Condensed Matter Physics,and Institute of Physics,Chinese Academy of Sciences,Beijing 100190,China;School of Physical Sciences,University of Chinese Academy of Sciences,Beijing 100049,China;Songshan Lake Materials Laboratory,Dongguan 523808,China;College of Physics and Electronic Engineering,Center for Computational Sciences,Sichuan Normal University,Chengdu 610068,China;Research Center for Functional Materials,National Institute for Materials Science,1-1 Namiki,Tsukuba 305-0044,Japan;International Center for Materials Nanoarchitectonics,National Institute for Materials Science,1-1 Namiki,Tsukuba 305-0044,Japan)

机构地区：[1]Beijing National Laboratory for Condensed Matter Physics,and Institute of Physics,Chinese Academy of Sciences,Beijing 100190,China [2]School of Physical Sciences,University of Chinese Academy of Sciences,Beijing 100049,China [3]Songshan Lake Materials Laboratory,Dongguan 523808,China [4]College of Physics and Electronic Engineering,Center for Computational Sciences,Sichuan Normal University,Chengdu 610068,China [5]Research Center for Functional Materials,National Institute for Materials Science,1-1 Namiki,Tsukuba 305-0044,Japan [6]International Center for Materials Nanoarchitectonics,National Institute for Materials Science,1-1 Namiki,Tsukuba 305-0044,Japan

出　　处：《Chinese Physics Letters》2023年第4期68-73,共6页中国物理快报（英文版）

基　　金：supported by the Key-Area Research and Development Program of Guangdong Province,China (Grant No.2020B0101340001);the National Key Research and Development Program of China (Grant Nos.2021YFA1202900 and 2020YFA0309600);the National Science Foundation of China (Grant Nos.61888102,11834017,1207441,and 12274447);the Strategic Priority Research Program of CAS(Grant Nos.XDB30000000 and XDB33000000);the supports from the Elemental Strategy Initiative conducted by the MEXT,Japan(Grant No.JPMXP0112101001);JSPS KAKENHI(Grant Nos.19H05790,20H00354,and 21H05233);A3 Foresight by JSPS。

摘　　要：Moiré superlattices have emerged as a highly controllable quantum platform for exploration of various fascinating phenomena,such as Mott insulator states,ferroelectric order,unconventional superconductivity and orbital ferromagnetism.Although remarkable progress has been achieved,current research in moiré physics has mainly focused on the single species properties,while the coupling between distinct moiré quantum phenomena remains elusive.Here we demonstrate,for the first time,the strong coupling between ferroelectricity and correlated states in a twisted quadrilayer MoS2moiré superlattice,where the twist angles are controlled in sequence to be ~57°,~0°,and ~-57°.Correlated insulator states are unambiguously established at moiré band filling factors v = 1,2,3 of twisted quadrilayer MoS_(2).Remarkably,ferroelectric order can occur at correlated insulator states and disappears quickly as the moiré band filling deviates from the integer fillings,providing smoking gun evidences of the coupling between ferroelectricity and correlated states.Our results demonstrate the coupling between different moiré quantum properties and will hold great promise for new moiré physics and applications.

关 键 词：FERROELECTRIC quantum TWISTED 

分 类 号：O469[理学—凝聚态物理]