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Directed motion of vortices in a current-driven Josephson junction network
Authors:T Kawaguchi  
Institution:aDepartment of Mathematics and Physics, University of Yamanashi, 4-4-37 Takeda, Kofu 400-8510, Japan
Abstract:Dynamics of directed motion of vortices in a Josephson junction network (JJN) with a ladder structure is studied using a numerical simulation. By applying spatial and temporal modulation of external bias currents, directed motion of vortices occurs in the absence of a ratchet-type asymmetric potential. In the present system, the asymmetry of the directed motion emerges as a dynamical effect due to the modulated bias current. Some dynamical effects such as mode-locking and vortex–antivortex excitation are relevant to the directed dynamics. We clarify the details of the directed motion of vortices in the JJN.
Keywords:Josephson junction network  Directed motion  Vortex dynamics
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