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Recent realizations of ultrathin freestanding perovskite oxides offer aunique platform to probe novel properties in two-dimensional oxides. Here, weobserved a giant flexoelectric response in freestanding BiFeO3 and SrTiO3 intheir bent state arising from strain gradients up to 4x10e7/m, suggesting apromising approach for realizing extremely large polarizations. Additionally, asubstantial reversible change in thickness was discovered in bent freestandingBiFeO3, which implies an unusual bending-expansion/shrinkage andthickness-dependence Poisson's ratios in this ferroelectric membrane that hasnever been seen before in crystalline materials. Our theoretical modelingreveals that this unprecedented flexural deformation within the membrane isattributable to a flexoelectricity-piezoelectricity interplay. The findingunveils intriguing nanoscale electromechanical properties and provides guidancefor their practical applications in flexible nanoelectromechanical systems.

Giant Polarization and Abnormal Flexural Deformation in Bent Freestanding Perovskite Oxides