Volume 45, Number 6, March II 1999
|Page(s)||700 - 706|
|Section||Condensed matter: electronic structure, electrical, magnetic and optical properties|
|Published online||01 September 2002|
Ratchet potential for fluxons in Josephson-junction arrays
Departamento de Física de la Materia Condensada e Instituto de Ciencia de Materiales de Aragón CSIC - Universidad de Zaragoza, 50009 Zaragoza, Spain
2 Departamento de Física Aplicada e Instituto de Ciencia de Materiales de Aragón CSIC Universidad de Zaragoza, 50009 Zaragoza, Spain
3 Department of Electrical Engineering and Computer Science Massachusetts Institute of Technology - Cambridge, MA 02139, USA
Accepted: 5 January 1999
We propose a simple configuration of a one-dimensional parallel array of Josephson junctions in which the pinning potential for trapped fluxons lacks inversion symmetry (ratchet potential). This system can be modelised by a set of non-linear pendula with alternating lenghts and asymmetric harmonic couplings. We show, by molecular dynamics simulation, that fluxons behave as single particles in which the predictions for overdamped thermal ratchets can be easily verified.
PACS: 74.50.+r – Proximity effects, weak links, tunneling phenomena, and Josephson effects / 05.40.-a – Fluctuation phenomena, random processes, and Brownian motion / 85.25.Na – Superconducting microelectronic circuits
© EDP Sciences, 1999
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