@article{b07795ccb402494594fe7b56f70c2a1c,
title = "Correlated interlayer exciton insulator in heterostructures of monolayer WSe2 and moir{\'e} WS2/WSe2",
abstract = "Moir{\'e} superlattices in van der Waals heterostructures have emerged as a powerful tool for engineering quantum phenomena. Here we report the observation of a correlated interlayer exciton insulator in a double-layer heterostructure composed of a WSe2 monolayer and a WS2/WSe2 moir{\'e} bilayer that are separated by ultrathin hexagonal boron nitride. The moir{\'e} WS2/WSe2 bilayer features a Mott insulator state when the density of holes is one per moir{\'e} lattice site. When electrons are added to the Mott insulator in the WS2/WSe2 moir{\'e} bilayer and an equal number of holes are injected into the WSe2 monolayer, a new interlayer exciton insulator emerges with the holes in the WSe2 monolayer and the electrons in the doped Mott insulator bound together through interlayer Coulomb interactions. The interlayer exciton insulator is stable up to a critical hole density in the WSe2 monolayer, beyond which the interlayer exciton dissociates. Our study highlights the opportunities for realizing quantum phases in double-layer moir{\'e} systems due to the interplay between the moir{\'e} flat band and strong interlayer electron interactions.",
author = "Zuocheng Zhang and Regan, {Emma C.} and Danqing Wang and Wenyu Zhao and Shaoxin Wang and Mohammed Sayyad and Kentaro Yumigeta and Kenji Watanabe and Takashi Taniguchi and Sefaattin Tongay and Michael Crommie and Alex Zettl and Zaletel, {Michael P.} and Feng Wang",
note = "Funding Information: This work was supported primarily by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, Materials Sciences and Engineering Division under contract no. DE-AC02-05-CH11231 (van der Waals heterostructures programme, KCWF16). The device fabrication was also supported by the U.S. Army Research Office under MURI award W911NF-17-1-0312. E.C.R. acknowledges support from the Department of Defense through the National Defense Science and Engineering Graduate Fellowship (NDSEG) Program. S.T. acknowledges support from DOE-SC0020653, NSF CMMI 1933214, NSF mid-scale 1935994, NSF 1904716, NSF DMR 1552220 and DMR 1955889. K.W. and T.T. acknowledge support from the Elemental Strategy Initiative conducted by the MEXT, Japan, grant no. PMXP0112101001, JSPS KAKENHI grant no. JP20H00354 and the CREST(JPMJCR15F3), JST. Publisher Copyright: {\textcopyright} 2022, The Author(s), under exclusive licence to Springer Nature Limited.",
year = "2022",
month = oct,
doi = "10.1038/s41567-022-01702-z",
language = "English (US)",
volume = "18",
pages = "1214--1220",
journal = "Nature Physics",
issn = "1745-2473",
publisher = "Nature Publishing Group",
number = "10",
}