Fig. 3

(Left) Schematic illustration of the HAXPES measurement setup and probed sample. (Right) Relative shift of the Pd 3d\(_{5/2}\) core line as a function of applied bias. The ”ON” state is plotted in blue and the ”OFF” state in red. Error bars represent the expected uncertainty in peak position (see text). The inset shows multiple I-V sweeps across the device prior to HAXPES measurement. Numbered points indicate specific bias positions, which correspond to the locations marked on the I–V sweeps shown in the inset.