We report on a novel dynamical phenomenon in electron spin resonance experiments of phosphorus donors. When strongly coupling the paramagnetic ensemble to a superconducting lumped element resonator, the coherent exchange between these two subsystems leads to a train of periodic, self-stimulated echoes after a conventional Hahn echo pulse sequence. The presence of these multiecho signatures is explained using a simple model based on spins rotating on the Bloch sphere, backed up by numerical calculations using the inhomogeneous Tavis-Cummings Hamiltonian.

中文翻译：

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强耦合自旋组件的脉冲电子自旋共振中的回波序列。

我们报告磷供体的电子自旋共振实验中的一种新型动力学现象。当将顺磁集合体强耦合到超导集总元件谐振器时，这两个子系统之间的相干交换会导致在常规的哈恩回波脉冲序列之后产生一系列周期性的，自激回波。使用基于在Bloch球上旋转的自旋的简单模型解释这些多回波签名的存在，并使用不均匀的Tavis-Cummings哈密顿量进行数值计算作为后盾。