The twisting dynamics of large lattice mismatch van der Waals heterostructures
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arXiv
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| Main Authors: | , , , , , , , , , |
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| Format: | Preprint |
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2024
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| _version_ | 1866929551619129344 |
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| author | Liao, Mengzhou Silva, Andrea Du, Luojun Nicolini, Paolo Claerbout, Victor E. P. Kramer, Denis Yang, Rong Shi, Dongxia Polcar, Tomas Zhang, Guangyu |
| author_facet | Liao, Mengzhou Silva, Andrea Du, Luojun Nicolini, Paolo Claerbout, Victor E. P. Kramer, Denis Yang, Rong Shi, Dongxia Polcar, Tomas Zhang, Guangyu |
| contents | Van der Waals (vdW) homo-/hetero-structures are ideal systems for studying interfacial tribological properties such as structural superlubricity. Previous studies concentrated on the mechanism of translational motion in vdW interfaces. However, detailed mechanisms and general properties of the rotational motion are barely explored. Here, we combine experiments and simulations to reveal the twisting dynamics of the MoS$_2$/graphite heterostructure. Unlike the translational friction falling into the superlubricity regime with no twist angle dependence, the dynamic rotational resistances highly depend on twist angles. Our results show that the periodic rotational resistance force originates from structural potential energy changes during the twisting. The structural potential energy of MoS$_2$/graphite heterostructure increases monotonically from0 to 30 degrees twist angles, and the estimated relative energy barrier is (1.43 +/- 0.36) x 10 J/m. The formation of Moiré superstructures in the graphene layer is the key to controlling the structural potential energy of the MoS$_2$/graphene heterostructure. Our results suggest that in twisting 2D heterostructures, even if the interface sliding friction is negligible, the evolving potential energy change results in a non-vanishing rotational resistance force. The structural change of the heterostructure can be an additional pathway for energy dissipation in the rotational motion, further enhancing the rotational friction force. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2410_15382 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | The twisting dynamics of large lattice mismatch van der Waals heterostructures Liao, Mengzhou Silva, Andrea Du, Luojun Nicolini, Paolo Claerbout, Victor E. P. Kramer, Denis Yang, Rong Shi, Dongxia Polcar, Tomas Zhang, Guangyu Mesoscale and Nanoscale Physics Materials Science Applied Physics Chemical Physics Van der Waals (vdW) homo-/hetero-structures are ideal systems for studying interfacial tribological properties such as structural superlubricity. Previous studies concentrated on the mechanism of translational motion in vdW interfaces. However, detailed mechanisms and general properties of the rotational motion are barely explored. Here, we combine experiments and simulations to reveal the twisting dynamics of the MoS$_2$/graphite heterostructure. Unlike the translational friction falling into the superlubricity regime with no twist angle dependence, the dynamic rotational resistances highly depend on twist angles. Our results show that the periodic rotational resistance force originates from structural potential energy changes during the twisting. The structural potential energy of MoS$_2$/graphite heterostructure increases monotonically from0 to 30 degrees twist angles, and the estimated relative energy barrier is (1.43 +/- 0.36) x 10 J/m. The formation of Moiré superstructures in the graphene layer is the key to controlling the structural potential energy of the MoS$_2$/graphene heterostructure. Our results suggest that in twisting 2D heterostructures, even if the interface sliding friction is negligible, the evolving potential energy change results in a non-vanishing rotational resistance force. The structural change of the heterostructure can be an additional pathway for energy dissipation in the rotational motion, further enhancing the rotational friction force. |
| title | The twisting dynamics of large lattice mismatch van der Waals heterostructures |
| topic | Mesoscale and Nanoscale Physics Materials Science Applied Physics Chemical Physics |
| url | https://arxiv.org/abs/2410.15382 |