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Research Article

Dynamic control of moiré potential in twisted WS2–WSe2 heterostructures

Shaofei Li1,2,§Haihong Zheng1,2,§Junnan Ding1Biao Wu1,2Jun He1Zongwen Liu3,4Yanping Liu1,2,5 ( )
School of Physics and Electronics, Hunan Key Laboratory for Super-microstructure and Ultrafast Process, Central South University, Changsha 410083, China
State Key Laboratory of High-Performance Complex Manufacturing, Central South University, Changsha 410083, China
School of Chemical and Biomolecular Engineering, The University of Sydney, NSW 2006, Australia
The University of Sydney Nano Institute, The University of Sydney, NSW 2006, Australia
Shenzhen Research Institute of Central South University, Shenzhen 518057, China

§ Shaofei Li and Haihong Zheng contributed equally to this work.

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Graphical Abstract

We observe the red-shift phenomenon of exciton resonances in the twisted heterostructures with a small angle at small pressures, achieving dynamic modulation in situ of moiré potentials by diamond anvil cell (DAC).

Abstract

Moiré superlattices are formed by a lattice mismatch or twist angle in two-dimensional materials, which can generate periodical moiré potentials leading to strong changes in the band structure, resulting in new quantum phenomena. However, the experimental engineering of in-situ deformation of moiré heterostructures remains deficient. Here, we demonstrate a dynamic local deformation of the twisted heterostructures using a diamond anvil cell (DAC), enabling in-situ dynamic modulation of moiré potential in twisted WS2–WSe2 heterostructures at room temperature. Deformation of the twisted heterostructure increases the moiré potential, causing a red shift of the moiré exciton resonance, and observed the red shift of the intralayer exciton resonance up to 16.3 meV (less than 1.1 GPa). The blue shift of the interlayer excitons of twisted WS2–WSe2 heterostructures shows an evident transition of the pressure sensitive exciton, induced by the dominant effect of modifying the band structure on optical properties. Combined with the spectral changes of pressurized Raman, which further demonstrated that the DAC can efficiently regulate the interlayer coupling. Our results offer an effective strategy for in-situ dynamic modulation of moiré potential, providing a promising platform for the development of novel quantum devices.

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Nano Research
Pages 7688-7694
Cite this article:
Li S, Zheng H, Ding J, et al. Dynamic control of moiré potential in twisted WS2–WSe2 heterostructures. Nano Research, 2022, 15(8): 7688-7694. https://doi.org/10.1007/s12274-022-4579-9
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Received: 09 May 2022
Revised: 23 May 2022
Accepted: 24 May 2022
Published: 09 June 2022
© Tsinghua University Press 2022
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