Defect Motion and Lattice Pinning Barrier in Josephson-Junction Ladders
Statistical Mechanics
2009-11-11 v1
Abstract
We study motion of domain wall defects in a fully frustrated Josephson-unction ladder system, driven by small applied currents. For small system sizes, the energy barrier E_B to the defect motion is computed analytically via symmetry and topological considerations. More generally, we perform numerical simulations directly on the equations of motion, based on the resistively-shunted junction model, to study the dynamics of defects, varying the system size. Coherent motion of domain walls is observed for large system sizes. In the thermodynamical limit, we find E_B=0.1827 in units of the Josephson coupling energy.
Cite
@article{arxiv.cond-mat/0512081,
title = {Defect Motion and Lattice Pinning Barrier in Josephson-Junction Ladders},
author = {H. Kang and Jong Soo Lim and J. -Y. Fortin and J. Choi and M. Y. Choi},
journal= {arXiv preprint arXiv:cond-mat/0512081},
year = {2009}
}
Comments
7 pages, and to apear in Phys. Rev. B