Fig. 4
From: Enhanced flexoelectricity at reduced dimensions revealed by mechanically tunable quantum tunnelling
Characterising flexoelectricity in ultrathin SrTiO3. a The blue squares and circles indicate φ1 and φ2, respectively, extracted by fitting the tunnelling spectra to Equation (5). The error bars represent the standard deviations of the extracted barrier heights. The red square and circle represent φ1 and φ2, respectively, for the triangular barrier at the critical ∂ut/∂x3. b (φ2 – φ1)/ed, calculated from a. The grey line shows a linear fit to the data. The error bars represent the standard deviations. Source data are provided as a Source Data file
