Full text loading...
Terahertz transmission spectra of the investigated samples. (a) Ratio of the power transmittances with and without bias. (b) Phase difference between the transmittances with and without bias.
(a) Real and (b) imaginary parts of the permittivity of STO layers for selected external fields; symbols: experiment; lines: fits using Eq. (1). In order to clarify the plot, data corresponding to were vertically shifted by 400, 800, 1200, and 1600 with increasing field. The vertical bars show the error of our absolute evaluation as deduced from the fitted value of .
Soft mode frequency as a function of the external electric field. The numbers indicate the order of individual measurements in this sequence to illustrate the observed hysteresis. Circles: measured data; crosses: experimental points from two to six mirrored to negative bias; dotted line: fit of the low-field part of the data using Eq. (3); solid line: linear fit of the saturated part of the dependence.
Article metrics loading...