Switching current of a Cooper pair transistor with tunable Josephson junctions

P. Ågren; J. Walter; D. B. Haviland

doi:10.1103/PhysRevB.66.014510

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Switching current of a Cooper pair transistor with tunable Josephson junctions

P. Ågren, J. Walter, D. B. Haviland

DOI 10.1103/PhysRevB.66.014510 · Physical Review B

T1

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Abstract

We investigate the switching current of a Cooper pair transistor with tunable Josephson energy. The junctions are fabricated in a superconducting quantum interference device (SQUID) geometry which allows for an in situ tunable effective Josephson energy by application of a magnetic field. We find a 2e-periodic switching current versus gate charge. As the magnetic field is increased the switching current stays 2e-periodic but the magnitude is suppressed. At a magnetic field of half a flux quantum through the SQUID’s the switching current is minimum. We can theoretically model the experimental data by assuming a switching current which is proportional to the ideal critical current squarred. We show that such a dependence is expected in the limit where the effect of thermal fluctuations on the system is strong.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
Al Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown