1988/01/01 by A. O. Sboychakov, Sergey Savel’ev, Sergey Savel'ev +3
Computer Science · Physics and Astronomy · Psychology · #Attachment and Relationship Dynamics #Quantum Information and Cryptography #Quantum and electron transport phenomena #cond-mat.other #stochastic dynamics and bifurcation
paper · pdf · doi:10.1103/physrevlett.104.190602
published as Phys.Rev.Lett.104:190602,2010 · 4 pages, 3 figures
openalex publication_date 1988/01/01 · arxiv created 2009/08/04 · arxiv updated 2010/05/25 · openalex created_date 2016/06/24 · openalex updated_date 2026/06/24
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 V(dc) 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 V(dc), can change its sign when varying the temperature T near the crossover temperature T* between the quantum and classical regimes.