Superradiance from Crystals of Molecular Nanomagnets

We show that crystals of molecular nanomagnets can exhibit giant magnetic relaxation due to the Dicke superradiance of electromagnetic waves. Rigorous theory is presented that combines superradiance with the Landau-Zener effect.

Figure 1

A pair of tunneling-split levels vs energy bias $W$. Coherent light is emitted after crossing the resonance via superradiance.

Figure 2

Time dependence of the probability to occupy the initial state $m$ during the linear energy sweep with different sweep rates and damping coefficients $\alpha$ obtained by numerical solution of Eq. (10).