Publikation: Moiré-Pattern Evolution Couples Rotational and Translational Friction at Crystalline Interfaces
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The sliding motion of objects is typically governed by their friction with the underlying surface. Compared to translational friction, however, rotational friction has received much less attention. Here, we experimentally and theoretically study the rotational depinning and orientational dynamics of two-dimensional colloidal crystalline clusters on periodically corrugated surfaces in the presence of magnetically exerted torques. We demonstrate that the traversing of locally commensurate areas of the moiré pattern through the edges of clusters, which is hindered by potential barriers during cluster rotation, controls its rotational depinning. The experimentally measured depinning thresholds as a function of cluster size strikingly collapse onto a universal theoretical curve which predicts the possibility of a superlow-static-torque state for large clusters. We further reveal a cluster-size-independent rotation-translation depinning transition when lattice-matched clusters are driven jointly by a torque and a force. Our work provides guidelines to the design of nanomechanical devices that involve rotational motions on atomic surfaces.
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CAO, Xin, Andrea SILVA, Emanuele PANIZON, Andrea VANOSSI, Nicola MANINI, Erio TOSATTI, Clemens BECHINGER, 2022. Moiré-Pattern Evolution Couples Rotational and Translational Friction at Crystalline Interfaces. In: Physical Review X. American Physical Society (APS). 2022, 12(2), 021059. eISSN 2160-3308. Available under: doi: 10.1103/PhysRevX.12.021059BibTex
@article{Cao2022Moire-57967, year={2022}, doi={10.1103/PhysRevX.12.021059}, title={Moiré-Pattern Evolution Couples Rotational and Translational Friction at Crystalline Interfaces}, number={2}, volume={12}, journal={Physical Review X}, author={Cao, Xin and Silva, Andrea and Panizon, Emanuele and Vanossi, Andrea and Manini, Nicola and Tosatti, Erio and Bechinger, Clemens}, note={Article Number: 021059} }
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