Dynamic Tuning of Moiré Excitons in a WSe2/WS2 Heterostructure via Mechanical Deformation

Zhao, Wenyu; Regan, Emma C.; Wang, Danqing; Jin, Chenhao; Hsieh, Satcher; Wang, Zhiyuan; Wang, Jialu; Wang, Zilin; Yumigeta, Kentaro; Blei, Mark; Watanabe, Kenji; Taniguchi, Takashi; Tongay, Sefaattin; Yao, Norman Y.; Wang, Feng

doi:10.1021/acs.nanolett.1c03611

Dynamic Tuning of Moiré Excitons in a WSe₂/WS₂ Heterostructure via Mechanical Deformation

Journal Article · Mon Oct 18 00:00:00 EDT 2021 · Nano Letters

DOI:https://doi.org/10.1021/acs.nanolett.1c03611· OSTI ID:1963832

^[1]; Regan, Emma C. ^[2]; Wang, Danqing ^[2]; Jin, Chenhao ^[3]; Hsieh, Satcher ^[2]; Wang, Zhiyuan ^[1]; Wang, Jialu ^[1]; Wang, Zilin ^[1]; Yumigeta, Kentaro ^[4]; Blei, Mark ^[4]; ^[5]; ^[5]; ^[4]; Yao, Norman Y. ^[2]; Wang, Feng ^[2]

Univ. of California, Berkeley, CA (United States)
Univ. of California, Berkeley, CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Materials Sciences Division
Kavli Institute at Cornell, Ithaca, NY (United States)
Arizona State Univ., Tempe, AZ (United States)
National Institute for Materials Science (NIMS), Tsukuba (Japan)

Moiré 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 moiré 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 moiré excitons and Wigner crystals. Here, in this study, we demonstrate the dynamic tuning of moiré 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 moiré potential, which leads to a red shift of the moiré exciton resonances. We observe the interlayer exciton resonance shifts up to 20 meV, while the intralayer exciton resonances shift up to 17 meV.

View Accepted Manuscript (DOE)

Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division; US Department of the Navy, Office of Naval Research (ONR); National Science Foundation (NSF); USDOD; Japan Society for the Promotion of Science (JSPS); Japan Science and Technology Agency

Grant/Contract Number:: AC02-05CH11231; SC0020653

OSTI ID:: 1963832

Journal Information:: Nano Letters, Journal Name: Nano Letters Journal Issue: 20 Vol. 21; ISSN 1530-6984

Publisher:: American Chemical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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Related Subjects

77 NANOSCIENCE AND NANOTECHNOLOGY
cryogenic near-field nanoscopy
excitons
fibers
heterostructures
layered materials
moire exciton
nanoindentation
stress