| CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
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Coupled Ferroelectricity and Correlated States in a Twisted Quadrilayer MoS$_{2}$ Moiré Superlattice |
| Fanfan Wu1,2, Lu Li1,2, Qiaoling Xu3,4, Le Liu1,2, Yalong Yuan1,2, Jiaojiao Zhao1,2, Zhiheng Huang1,2, Xiaozhou Zan1,2, Kenji Watanabe5, Takashi Taniguchi6, Dongxia Shi1,2,3, Lede Xian3, Wei Yang1,2,3, Luojun Du1,2*, and Guangyu Zhang1,2,3* |
1Beijing National Laboratory for Condensed Matter Physics, and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
2School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100049, China
3Songshan Lake Materials Laboratory, Dongguan 523808, China
4College of Physics and Electronic Engineering, Center for Computational Sciences, Sichuan Normal University, Chengdu 610068, China
5Research Center for Functional Materials, National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-0044, Japan
6International Center for Materials Nanoarchitectonics, National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-0044, Japan
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| Cite this article: |
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Fanfan Wu, Lu Li, Qiaoling Xu et al 2023 Chin. Phys. Lett. 40 047303 |
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Abstract 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 MoS$_{2}$ moiré superlattice, where the twist angles are controlled in sequence to be $\sim$ $57^{\circ}$, $\sim$ $0^{\circ}$, and $\sim$ $-57 ^{\circ}$. 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.
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Received: 27 February 2023
Express Letter
Published: 20 March 2023
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| PACS: |
73.21.Cd
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(Superlattices)
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73.63.-b
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(Electronic transport in nanoscale materials and structures)
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77.80.-e
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(Ferroelectricity and antiferroelectricity)
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