Photon-induced Spin Tunneling in Giant Molecules Coupled to Superconducting Resonators

We present a model of magnetization relaxation of Mn12-acetate strongly coupled with photonic cavity resonator in low-temperature regimes (T $\leq$ 1K), a model based on photon-assisted-spin-tunnelling-induced, quartic magnetic anisotropy, on weak transverse magnetic fields and on photonic excitations. With the model, one calculates the spin-tunnelling rate as a function of the longitudinal magnetic field, whence we further determine the transition probability of a trapped photon as a function of both photon energy and external transverse magnetic field strength. This research is supported by the Sofja Kovalevskaja prize and German DFG (SFB-TRR21 and SPP1601).