@article{a78ccc29c0fe4642b1e16e98fdada3a7,
title = "Dynamic Tuning of Moir{\'e} Excitons in a WSe2/WS2Heterostructure via Mechanical Deformation",
abstract = "Moir{\'e} superlattices in van der Waals (vdW) heterostructures form by stacking atomically thin layers on top of one another with a twist angle or lattice mismatch. The resulting moir{\'e} potential leads to a strong modification of the band structure, which can give rise to exotic quantum phenomena ranging from correlated insulators and superconductors to moir{\'e} excitons and Wigner crystals. Here, we demonstrate the dynamic tuning of moir{\'e} potential in a WSe2/WS2 heterostructure at cryogenic temperature. We utilize the optical fiber tip of a cryogenic scanning near-field optical microscope (SNOM) to locally deform the heterostructure and measure its near-field optical response simultaneously. The deformation of the heterostructure increases the moir{\'e} potential, which leads to a red shift of the moir{\'e} exciton resonances. We observe the interlayer exciton resonance shifts up to 20 meV, while the intralayer exciton resonances shift up to 17 meV.",
keywords = "Cryogenic near-field nanoscopy, Moir{\'e} exciton, Nanoindentation",
author = "Wenyu Zhao and Regan, {Emma C.} and Danqing Wang and Chenhao Jin and Satcher Hsieh and Zhiyuan Wang and Jialu Wang and Zilin Wang and Kentaro Yumigeta and Mark Blei and Kenji Watanabe and Takashi Taniguchi and Sefaattin Tongay and Yao, {Norman Y.} and Feng Wang",
note = "Funding Information: This work was supported primarily by the Director, Office of Science, Office of Basic Energy Sciences, Materials Sciences and Engineering Division of the U.S. Department of Energy under contract number DE-AC02-05CH11231 (van der Waals heterostructures program, KCWF16). This device fabrication was supported by the Office of Naval research (MURI award N00014-16-1-2921). S.T acknowledges the use of facilities within the Eyring Materials Center at Arizona State University supported in part by NNCI-ECCS-1542160. S.T acknowledges support from DOE-SC0020653, NSF CMMI 1933214, NSF DMR 1552220, and DMR 1955889. K.W. and T.T. acknowledge support from the Elemental Strategy Initiative conducted by the MEXT, Japan, Grant JPMXP0112101001, JSPS KAKENHI Grant JP20H00354, and the CREST(JPMJCR15F3), JST. E.C.R. acknowledges support from the Department of Defense through the National Defense Science and Engineering Graduate Fellowship (NDSEG) Program. Publisher Copyright: {\textcopyright} 2021 American Chemical Society.",
year = "2021",
month = oct,
day = "27",
doi = "10.1021/acs.nanolett.1c03611",
language = "English (US)",
volume = "21",
pages = "8910--8916",
journal = "Nano Letters",
issn = "1530-6984",
publisher = "American Chemical Society",
number = "20",
}