Asymmetric Long Josephson Junction Acting as a Ratchet for a Quantum Field
A. O. Sboychakov, Sergey Savel’ev, A. L. Rakhmanov, Franco Nori
DOI 10.1103/PhysRevLett.104.190602 · Physical Review Letters
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Abstract
We study the escape rate of flux quanta in a long Josephson junction having an asymmetric spatial inhomogeneous critical current density. Such a junction can behave as a ratchet when driven by an ac current in the presence of a magnetic field. This rectification gives rise to a dc voltage Vdc across the junction. The usual approach of particlelike tunneling cannot describe this rectification, and a quantum field theory description is required. We also show that, under specific conditions, the rectification direction, and consequently Vdc, can change its sign when varying the temperature T near the crossover temperature T* between the quantum and classical regimes.
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