Towards an experimental proof of the magnonic Aharonov-Casher effect

The Aharonov-Casher effect is the accumulation of the wave function phase when a particle with magnetic moment passes through an electric field. This phenomenon is observed for real particles and predicted for quasiparticles such as magnons. Here, the authors investigate the impact of a strong electric field on the phase of dipolar spin waves exited in a ferromagnetic yttrium iron garnet (YIG) film and report the experimental results in favor of the magnonic Aharonov-Casher effect.