The second-order sideband enhancement in spinning resonators with an external phonon pump Qinghong Liao, Menglin Song, Haiyan Qiu and Weida Bao Eur. Phys. J. Plus, 137 11 (2022) 1247 Published online: 16 November 2022 DOI: 10.1140/epjp/s13360-022-03461-5