Probing coherences and itinerant magnetism

We use dynamical decoupling to preserve spin coherence against magnetic fluctuations, which allows us to study itinerant magnetism of lattice-trapped magnetic atoms, driven by magnetic dipole-dipole interactions, in the low-entropy and close-to-unit filling regime. The results are presented in our new paper.

Our experiment reveals a dynamical instability in the SF regime, due to the dipolar coupling between magnons, and a new effect associated with DDIs in the strongly correlated itinerant regime. This experiment is made possible by a dynamic decoupling technique (DD), where π pulses are repeatedly applied to the sample. DD considerably increases the coherence lifetime.