Physics – Condensed Matter – Superconductivity
Scientific paper
1998-08-12
Phys. Rev. B 60, 588 (1999)
Physics
Condensed Matter
Superconductivity
6 pages including 4 figures in two columns, final version
Scientific paper
10.1103/PhysRevB.60.588
Two-dimensional Josephson junction arrays at zero temperature are investigated numerically within the resistively shunted junction (RSJ) model and the time-dependent Ginzburg-Landau (TDGL) model with global conservation of current implemented through the fluctuating twist boundary condition (FTBC). Fractional giant Shapiro steps are found for {\em both} the RSJ and TDGL cases. This implies that the local current conservation, on which the RSJ model is based, can be relaxed to the TDGL dynamics with only global current conservation, without changing the sequence of Shapiro steps. However, when the maximum widths of the steps are compared for the two models some qualitative differences are found at higher frequencies. The critical current is also calculated and comparisons with earlier results are made. It is found that the FTBC is a more adequate boundary condition than the conventional uniform current injection method because it minimizes the influence of the boundary.
Kim Beom Jun
Minnhagen Petter
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