Recently, a collaborative research team from the Institute of Physics at the Chinese Academy of Sciences/Beijing National Laboratory for Condensed Matter Physics, working alongside scholars from Tsinghua University and Nanjing University, has achieved a significant milestone in the exploration of the ultrafast dynamics of topological ferroelectric materials. Their study revealed that polar skyrmions within PbTiO3/SrTiO3 superlattices demonstrate collective dynamic behaviors at frequencies below 2 terahertz (THz).

Leveraging terahertz field-induced second harmonic generation technology, the researchers successfully established resonant coupling. This achievement propelled the system into a transient hidden polar phase, facilitating stable control across a temperature spectrum ranging from 4 Kelvin (K) to 470 K. Moreover, the team captured multiple instances of transient polarization flips and pinpointed two distinct characteristic excitation modes, operating at 0.2 THz and 2.1 THz, respectively. The pertinent research findings have been published in the esteemed journal Nature Physics.