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Topological polar vortices that are the electric analogues of magneticobjects, present great potential in applications of future nanoelectronics dueto their nanometer size, anomalous dielectric response, and chirality. Toenable the functionalities, it is prerequisite to manipulate the polar statesand chirality by using external stimuli. Here, we probe the evolutions of polarstate and chirality of polar vortices in PbTiO3/SrTiO3 superlattices underelectric field by using atomically resolved in situ scanning transmissionelectron microscopy and phase-field simulations. We find that the adjacentclockwise and counterclockwise vortex usually have opposite chirality. Thephase-field simulations suggest that the rotation reversal or axialpolarization switching can lead to the chirality change. Guided by which, weexperimentally validate that the vortex rotation direction can be changed byapplying and subsequently removing of electric fields, offering a potentialstrategy to manipulate the vortex chirality. The revealed details of dynamicbehavior for individual polar vortices at atomic scale and the proposedstrategy for chirality manipulation provide fundamentals for future deviceapplications.

Manipulation of polar vortex chirality in oxide superlattices