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Aharonov-Casher-Effect Suppression of Macroscopic Tunneling of Magnetic Flux

Aharonov-Casher-Effect Suppression of Macroscopic Tunneling of Magnetic Flux

We suggest a system in which the amplitude of macroscopic flux tunneling can be modulated via the Aharonov-Casher effect. The system is an rf SQUID with the Josephson junction replaced by a Bloch transistor--two junctions separated by a small superconducting island on which the charge can be induced by an …