A photonic Carnot engine powered by a spin-star network Deniz Türkpençe, Ferdi Altintas, Mauro Paternostro and Özgür E. Müstecaplioğlu EPL, 117 5 (2017) 50002 Published online: 26 April 2017 DOI: 10.1209/0295-5075/117/50002