We report a molecular Wankel motor, the dual-ring structure B13+, driven by circularly-polarized infrared electromagnetic radiation, under which a guided uni-directional rotation of the outer ring is achieved with rotational frequency of the order of 300 MHz.
Cite
@article{arxiv.1204.2505,
title = {Photo-driven Molecular Wankel Engine B$_{13}^+$},
author = {Jin Zhang and Alina P. Sergeeva and Manuel Sparta and Anastassia N. Alexandrova},
journal= {arXiv preprint arXiv:1204.2505},
year = {2012}
}