Cavity-mediated stationary atom–mirror entanglement in the presence of photothermal effects

We study stationary entanglement properties of an optomechanical system containing an atomic ensemble. We focus onto the case of the movable mirror strongly coupled to the cavity field through both radiation pressure and photothermal force. Exploiting a quantum Langevin equation approach we investigate the bipartite entanglement properties of various bipartite subsystems as well as stationary tripartite entanglement of the system. We particularly study robustness of the atom–mirror entanglement against temperature. We show that, even though the photothermal force is a dissipative force, it can significantly improve the cavity mediated atom–mirror entanglement. -- Highlights: ► We study atom–optomechanical systems strongly coupled through photothermal effects. ► The photothermal force can enhance atom–mirror entanglement in such systems. ► Robustness of the entanglement against temperature improves by photothermal force. ► The stationary tripartite entanglement is affected by the photothermal force.