Raman scattering investigation of twisted WS2/MoS2 heterostructures : interlayer mechanical coupling versus charge transfer
Twisted van der Waals homo- and hetero-structures have aroused great attentions due to their unique physical properties, providing a new platform to explore the novel two-dimensional (2D) condensed matter physics. The robust dependence of phonon vibrations and electronic band structures on the twist...
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Science::Physics::Optics and light Engineering::Materials::Photonics and optoelectronics materials van der Waals Heterostructures Interlayer Coupling |
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Science::Physics::Optics and light Engineering::Materials::Photonics and optoelectronics materials van der Waals Heterostructures Interlayer Coupling Wu, Lishu Cong, Chunxiao Shang, Jingzhi Yang, Weihuang Chen, Yu Zhou, Jiadong Ai, Wei Wang, Yanlong Feng, Shun Zhang, Hongbo Liu, Zheng Yu, Ting Raman scattering investigation of twisted WS2/MoS2 heterostructures : interlayer mechanical coupling versus charge transfer |
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Twisted van der Waals homo- and hetero-structures have aroused great attentions due to their unique physical properties, providing a new platform to explore the novel two-dimensional (2D) condensed matter physics. The robust dependence of phonon vibrations and electronic band structures on the twist angle has been intensively observed in transition metal dichalcogenide (TMD) homo-structures. However, the effects of twist angle on the lattice vibrational properties in the TMD heterostructures have not caused enough attention. Here, we report the distinct evolutions of Raman scattering and the underlying interlayer interactions in the twisted WS2/MoS2 heterostructures. The shifts and linewidths of E2g(Γ) and A1g(Γ) phonon modes are found to be twist angle dependent. In particular, analogous to that of the twisted TMD homostructures, the frequency separations between E2g(Γ) and A1g(Γ) modes of MoS2 and WS2 in the twisted heterostructures varying with twist angle correlate with the interlayer mechanical coupling, essentially originating from the spacing-related repulsion between sulfur atoms. Moreover, the opposite shift behaviors and broadening of A1g(Γ) modes caused by charge transfer are also observed in the twisted heterostructures. The calculated interlayer distances and band alignment of twisted WS2/MoS2 through density functional theory further evidence our interpretations on the roles of the interlayer mechanical coupling and charge transfer in variations of Raman features. Such understanding and controlling of interlayer interaction through the stacking orientation are significant for future optoelectronic device design based on the newly emerged 2D heterostructures. [Figure not available: see fulltext.] |
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School of Physical and Mathematical Sciences |
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School of Physical and Mathematical Sciences Wu, Lishu Cong, Chunxiao Shang, Jingzhi Yang, Weihuang Chen, Yu Zhou, Jiadong Ai, Wei Wang, Yanlong Feng, Shun Zhang, Hongbo Liu, Zheng Yu, Ting |
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Wu, Lishu Cong, Chunxiao Shang, Jingzhi Yang, Weihuang Chen, Yu Zhou, Jiadong Ai, Wei Wang, Yanlong Feng, Shun Zhang, Hongbo Liu, Zheng Yu, Ting |
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Wu, Lishu |
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Raman scattering investigation of twisted WS2/MoS2 heterostructures : interlayer mechanical coupling versus charge transfer |
title_short |
Raman scattering investigation of twisted WS2/MoS2 heterostructures : interlayer mechanical coupling versus charge transfer |
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Raman scattering investigation of twisted WS2/MoS2 heterostructures : interlayer mechanical coupling versus charge transfer |
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Raman scattering investigation of twisted WS2/MoS2 heterostructures : interlayer mechanical coupling versus charge transfer |
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Raman scattering investigation of twisted WS2/MoS2 heterostructures : interlayer mechanical coupling versus charge transfer |
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raman scattering investigation of twisted ws2/mos2 heterostructures : interlayer mechanical coupling versus charge transfer |
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2021 |
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https://hdl.handle.net/10356/146821 |
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sg-ntu-dr.10356-1468212023-02-28T19:59:36Z Raman scattering investigation of twisted WS2/MoS2 heterostructures : interlayer mechanical coupling versus charge transfer Wu, Lishu Cong, Chunxiao Shang, Jingzhi Yang, Weihuang Chen, Yu Zhou, Jiadong Ai, Wei Wang, Yanlong Feng, Shun Zhang, Hongbo Liu, Zheng Yu, Ting School of Physical and Mathematical Sciences School of Materials Science and Engineering Division of Physics and Applied Physics Science::Physics::Optics and light Engineering::Materials::Photonics and optoelectronics materials van der Waals Heterostructures Interlayer Coupling Twisted van der Waals homo- and hetero-structures have aroused great attentions due to their unique physical properties, providing a new platform to explore the novel two-dimensional (2D) condensed matter physics. The robust dependence of phonon vibrations and electronic band structures on the twist angle has been intensively observed in transition metal dichalcogenide (TMD) homo-structures. However, the effects of twist angle on the lattice vibrational properties in the TMD heterostructures have not caused enough attention. Here, we report the distinct evolutions of Raman scattering and the underlying interlayer interactions in the twisted WS2/MoS2 heterostructures. The shifts and linewidths of E2g(Γ) and A1g(Γ) phonon modes are found to be twist angle dependent. In particular, analogous to that of the twisted TMD homostructures, the frequency separations between E2g(Γ) and A1g(Γ) modes of MoS2 and WS2 in the twisted heterostructures varying with twist angle correlate with the interlayer mechanical coupling, essentially originating from the spacing-related repulsion between sulfur atoms. Moreover, the opposite shift behaviors and broadening of A1g(Γ) modes caused by charge transfer are also observed in the twisted heterostructures. The calculated interlayer distances and band alignment of twisted WS2/MoS2 through density functional theory further evidence our interpretations on the roles of the interlayer mechanical coupling and charge transfer in variations of Raman features. Such understanding and controlling of interlayer interaction through the stacking orientation are significant for future optoelectronic device design based on the newly emerged 2D heterostructures. [Figure not available: see fulltext.] Ministry of Education (MOE) National Research Foundation (NRF) Accepted version This work was mainly supported by the National Key R&D Program of China (Grant No. 2018YFA0703700) and the Ministry of Education, Singapore, MOE Tier 1 RG93/19, NRF-CRP-21-2018-0007, MOE2018-T2-2-072, and MOE2019- T2-1-004. C. X. C. also thanks the support of the National Natural Science Foundation of China (Grant No. 61774040), the Shanghai Municipal Science and Technology Commission (Grant No. 18JC1410300), the Fudan University-CIOMP Joint Fund (Grant No. FC2018-002), the National Young 1000 Talent Plan of China, and the Shanghai Municipal Natural Science Foundation (No. 16ZR1402500). J. Z. S. appreciates the support of the Fundamental Research Funds for the Central Universities of China, National Natural Science Foundation of China under Grant No. 61904151, Natural Science Foundation of Shaanxi under Grant No. 2020JM-108, and the Joint Research Funds of Department of Science & Technology of Shaanxi Province and Northwestern Polytechnical University (No. 2020GXLH-Z-020). Z. L. acknowledges the support of MOE Tier 1 grant RG164/15, Tier 2 grant MOE2016-T2-2-153, and MOE2015-T2-2-007, and Singapore National Research Foundation under NRF award No. NRF-NRFF2013-08. W. H. Y. acknowledges the support of the National Natural Science Foundations of China (Grant No. 61704040). This research was also supported by Zhejiang Provincial Natural Science Foundation of China (Grant No. LGG19F040003). 2021-03-11T07:43:25Z 2021-03-11T07:43:25Z 2021 Journal Article Wu, L., Cong, C., Shang, J., Yang, W., Chen, Y., Zhou, J., Ai, W., Wang, Y., Feng, S., Zhang, H., Liu, Z. & Yu, T. (2021). Raman scattering investigation of twisted WS2/MoS2 heterostructures : interlayer mechanical coupling versus charge transfer. Nano Research. https://dx.doi.org/10.1007/s12274-020-3193-y 1998-0124 https://hdl.handle.net/10356/146821 10.1007/s12274-020-3193-y 2-s2.0-85099991802 en MOE Tier 1 RG93/19 NRF-CRP-21-2018-0007 MOE2018-T2-2-072 MOE2019-T2-1-004 Nano Research © 2020 Tsinghua University Press and Springer-Verlag GmbH Germany, part of Springer Nature. All rights reserved. This paper was published in Nano Research and is made available with permission of Tsinghua University Press and Springer-Verlag GmbH Germany, part of Springer Nature. application/pdf |