The ac Hall effect can provide valuable insights into the dynamics of an electronic medium. This has recently been demonstrated in the case of high-Tc superconductors [1,2]: Various theoretical models based on different scattering mechanisms agree that the anomalous frequency and temperature dependences of the Hall effect are closely intertwined, but they differ in their predictions about these...

The quantum anomalous Hall effect (QAHE) realizes dissipationless longitudinal resistivity and quantized resistance without the need of an external magnetic field. However, when reducing device dimensions or increasing current density, abrupt breakdown state occurs with a relatively small critical current, limiting applications QAHE. We investigate mechanism this by studying multi-terminal devi...