Extraordinary Carrier Diffusion on CdTe Surfaces Uncovered by 4D Electron Microscopy

？ The 4D microscope reveals superb carrier diffusion on surfaces of CdTe single crystals ？ The carrier diffusion on CdTe surfaces is orientation and termination dependent ？ Polar surfaces of (211) form thin oxide layers, suppressing the carrier diffusivity ？ Real-space visualization of charge-carrier dynamics at the atomic surface level of CdT