Manipulation of double-four-wave mixing in an atomic system under vortex-beam illumination Chen Peng, Shuaijun Zheng, Hongwei Wang, Chunling Ding and Rui-Bo Jin Eur. Phys. J. D, 77 6 (2023) 112 Published online: 20 June 2023 DOI: 10.1140/epjd/s10053-023-00701-w