Twisting dynamics of large lattice-mismatch van der Waals heterostructures

0574645 - FZÚ 2024 RIV US eng J - Journal Article
Liao, M. - Silva, A. - Du, L. - Nicolini, Paolo - Claerbout, V.E.P. - Kramer, D. - Yang, R. - Shi, D. - Polcar, T. - Zhang, G.
Twisting dynamics of large lattice-mismatch van der Waals heterostructures.
ACS Applied Materials and Interfaces. Roč. 15, č. 15 (2023), s. 19616-19623. ISSN 1944-8244. E-ISSN 1944-8252
Research Infrastructure: e-INFRA CZ - 90140
Institutional support: RVO:68378271
Keywords : 2D heterostructure * twising dynamics * Moire * AFM technique * superlubricity
OECD category: Condensed matter physics (including formerly solid state physics, supercond.)
Impact factor: 9.5, year: 2022
Method of publishing: Limited access
https://doi.org/10.1021/acsami.3c00558

Van der Waals (vdW) homo/heterostructures 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 MoS2/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 MoS2/graphite heterostructure increases monotonically from 0° to 30° twist angles, and the estimated relative energy barrier is (1.43 ± 0.36) × 10–3 J/m2. The formation of Moiré superstructures in the graphene layer is the key to controlling the structural potential energy of the MoS2/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 nonvanishing 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.

Permanent Link: https://hdl.handle.net/11104/0346994