Express Letter
Coupled Ferroelectricity and Correlated States in a Twisted Quadrilayer MoS2 Moiré Superlattice
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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 MoS2 moiré 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 MoS2. 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. -
Acknowledgements.: This work was 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), and the Strategic Priority Research Program of CAS (Grant Nos. XDB30000000 and XDB33000000). K.W. and T.T. acknowledge the supports from the Elemental Strategy Initiative conducted by the MEXT, Japan (Grant No. JPMXP0112101001), JSPS KAKENHI (Grant Nos. 19H05790, 20H00354, and 21H05233) and A3 Foresight by JSPS.
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