Fig. 2: Observation of ferroelectric polarization.

a Spatial charge distribution across drum from Raman scaling analysis of drum in Fig. 1(d), (b) time-resolved current measurement with fits to switching (\(\tau =1\,\mu {{{\rm{s}}}}\)) and polarization (\(\tau =1\,{{{\rm{ms}}}}\)) processes, (inset) high speed measurement of switching transition, (c) current-voltage characteristics obtained by PUVD technique at different polarization conditions (inset) schematic of PUVD scheme, (d) time evolution of polarization with charging, (e) high-frequency measurement of dielectric constant with fit to Debye relaxation model, (f) plot of extracted relaxation time constant \(\tau\) during switching.