The possibilities of combining several degrees of freedom inside a unique material have recently been highlighted in their dynamics and proposed as information carriers in quantum devices where their cross-manipulation by external parameters such as electric and magnetic fields could enhance their functionalities. An emblematic example is that of electromagnons, spin-waves dressed with electric dipoles, that are fingerprints of multiferroics. Point-like objects have also been identified, which may take the form of excited quasiparticles. This is the case for magnetic monopoles, the exotic excitations of spin ices, that have been recently proposed to carry an electric dipole, although experimental evidences remain elusive. Presently, we investigate the electrical signature of a classical spin ice and a related compound that supports quantum fluctuations. Our in-depth study clearly attributes magneto-electricity to the correlated spin ice phase distinguishing it from extrinsic and single-ion effects. Our calculations show that the proposed model conferring magneto-electricity to monopoles is not sufficient, calling for higher-order contributions.

最近，在独特材料内部组合多个自由度的可能性在其动力学中得到了强调，并被提议作为量子设备中的信息载体，其中它们通过电场和磁场等外部参数的交叉操纵可以增强其功能。一个标志性的例子是电磁子，即带有电偶极子的自旋波，这是多铁性材料的指纹。点状物体也已被识别，它们可能采取激发准粒子的形式。磁单极子就是这种情况，即自旋冰的奇异激发，最近被提议携带电偶极子，尽管实验证据仍然难以捉摸。目前，我们研究了经典自旋冰和支持量子涨落的相关化合物的电学特征。我们的深入研究清楚地将磁电归因于相关的自旋冰相，将其与外在效应和单离子效应区分开来。我们的计算表明，所提出的赋予单极子磁电的模型是不够的，需要更高阶的贡献。