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Charge screening on a polar surface under ambient conditions is difficult to investigate, because the surface is immediately affected by adsorbed polar molecules and ions. The authors control the degree of screening on a ferroelectric surface using charge gradient microscopy, and find that the kinetics is governed by an exponential recovery with a universal time constant, independent of the degree of screening. This study demonstrates that the degree of screening at a ferroelectric surface can be controlled mechanically, without disturbing the polarization beneath.

Mechanical Removal and Rescreening of Local Screening Charges at Ferroelectric Surfaces