@article{9de52f0fab5e4b6ebaf9a1f1caec0f4a,
title = "Tuning moir{\'e} excitons and correlated electronic states through layer degree of freedom",
abstract = "Moir{\'e} coupling in transition metal dichalcogenides (TMDCs) superlattices introduces flat minibands that enable strong electronic correlation and fascinating correlated states, and it also modifies the strong Coulomb-interaction-driven excitons and gives rise to moir{\'e} excitons. Here, we introduce the layer degree of freedom to the WSe2/WS2 moir{\'e} superlattice by changing WSe2 from monolayer to bilayer and trilayer. We observe systematic changes of optical spectra of the moir{\'e} excitons, which directly confirm the highly interfacial nature of moir{\'e} coupling at the WSe2/WS2 interface. In addition, the energy resonances of moir{\'e} excitons are strongly modified, with their separation significantly increased in multilayer WSe2/monolayer WS2 moir{\'e} superlattice. The additional WSe2 layers also modulate the strong electronic correlation strength, evidenced by the reduced Mott transition temperature with added WSe2 layer(s). The layer dependence of both moir{\'e} excitons and correlated electronic states can be well described by our theoretical model. Our study presents a new method to tune the strong electronic correlation and moir{\'e} exciton bands in the TMDCs moir{\'e} superlattices, ushering in an exciting platform to engineer quantum phenomena stemming from strong correlation and Coulomb interaction.",
author = "Dongxue Chen and Zhen Lian and Xiong Huang and Ying Su and Mina Rashetnia and Li Yan and Mark Blei and Takashi Taniguchi and Kenji Watanabe and Sefaattin Tongay and Zenghui Wang and Chuanwei Zhang and Cui, {Yong Tao} and Shi, {Su Fei}",
note = "Funding Information: We thank professor Feng Wang and professor Chenhao Jin for their helpful discussions. The optical spectroscopy measurements are supported by an AFOSR DURIP award through Grant FA9550-20-1-0179. The device fabrication was supported by the Micro and Nanofabrication Clean Room (MNCR) at Rensselaer Polytechnic Institute (RPI). Z. Lian and S.-F.S. acknowledge support from NYSTAR through Focus Center-NY–RPI Contract C150117. S.-F.S. also acknowledges the support from NSF (Career Grant DMR-1945420 and DMR-2104902) and AFOSR (FA9550-18-1-0312). X.H. and Y.-T.C. acknowledge support from NSF under award DMR- 2104805. Y.S. and C.Z. acknowledge support from NSF PHY-2110212, PHY-1806227, ARO (W911NF17-1-0128), and AFOSR (FA9550-20-1-0220). D.C. acknowledges support from the National Natural Science Foundation of China, Grant number 62004032. S.T. acknowledges support from NSF DMR-1904716, DMR-1838443, CMMI-1933214, and DOE-SC0020653. K.W. and T.T. acknowledge support from the Elemental Strategy Initiative conducted by the MEXT, Japan, Grant Number JPMXP0112101001 and JSPS KAKENHI, Grant Numbers 19H05790 and JP20H00354. L.X. and D.S. acknowledge support from the U.S. Department of Energy (no. DE-FG02-07ER46451) for magneto-spectroscopy measurements performed at the National High Magnetic Field Laboratory, which is supported by the National Science Foundation through NSF/DMR-1644779 and the State of Florida. Publisher Copyright: {\textcopyright} 2022, The Author(s).",
year = "2022",
month = dec,
doi = "10.1038/s41467-022-32493-9",
language = "English (US)",
volume = "13",
journal = "Nature communications",
issn = "2041-1723",
publisher = "Nature Publishing Group",
number = "1",
}