Aharonov-Casher-Effect Suppression of Macroscopic Tunneling of Magnetic Flux
arXiv:cond-mat/0109544 · doi:10.1103/PhysRevLett.88.050403
Abstract
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 external gate voltage. When the Josephson coupling energies of the junctions are equal and the induced charge is q=e, destructive interference between tunneling paths brings the flux tunneling rate to zero. The device may also be useful as a qubit for quantum computation.
RevTeX, 9 pages, 3 figures, submitted to Phys. Rev. Lett
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