Enhanced entanglement in the hybrid optomechanical system assisted by the nitrogen-vacancy center ensemble in diamondRuochuang Liu, Qinghong Liao, Qingmin Zhao and Zhuo ZhangEur. Phys. J. D, 77 5 (2023) 84DOI: https://doi.org/10.1140/epjd/s10053-023-00654-0