激子
异质结
材料科学
凝聚态物理
范德瓦尔斯力
超晶格
量子阱
光电子学
半导体
光学
物理
激光器
分子
量子力学
作者
Wenyu Zhao,Emma C. Regan,Danqing Wang,Jin Choi,Satcher Hsieh,Zhiyuan Wang,Jialu Wang,Zilin Wang,Kentaro Yumigeta,Mark Blei,Kenji Watanabe,Takashi Taniguchi,Sefaattin Tongay,Norman Y. Yao,Rui Wang
出处
期刊:Nano Letters
[American Chemical Society]
日期:2021-10-18
卷期号:21 (20): 8910-8916
被引量:14
标识
DOI:10.1021/acs.nanolett.1c03611
摘要
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, 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.
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