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(a) Electron micrograph of a CPT with SQUID arrays and diagram of measurement circuit (left) and an enlarged image of the CPT island (right). (b) Current-voltage characteristics of two SQUID arrays around zero bias in sample Al-6 at for values of magnetic flux from zero to half flux quantum through each SQUID. Zero bias resistance of the arrays varies from up to in this case.
Gate induced CPT voltage modulation of Al-6 sample at (a) at different bias currents at and (b) at different bath temperatures.
Gate induced CPT voltage modulation of (a) sample Al-6 and (b) Nb-4 at different magnetic fields and at . Biasing point for both samples corresponds to supercurrent branch of characteristics. Zero bias resistance of the SQUID arrays is marked on the curves.
Parameters of the measured CPTs.
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