Figure 3
From: Dielectric collapse at the LaAlO3/SrTiO3 (001) heterointerface under applied electric field
Ti 2p core-level spectra of LaAlO3/SrTiO3 heterostructures measured using (a) SX-PES (hν = 1.2 keV, θ = 0 degree) and (b) HAX-PES (hν = 7.9 keV, θ = 0 degree) with applied gate voltage. Plots of relative binding energy (B.E.) shift between (c) Ti 2p and La 4d core-level spectra (filled circles), Ti 2p and Al 2p (open triangles) for SX-PES data, and (d) Ti 2p and La 4d core level spectra (filled circles) from HAX-PES data. The error bars in (c,d) were obtained from the accuracy of the peak fitting. The two sets of data points correspond to the forward and backward voltage sweeps to evaluate a possible hysteresis.
