Kink Dynamics in a One-Dimensional Non-Conserved TDGL System with a Quenched Impurity

概要

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Dynamics of a kink in the presence of a quenched impurity is investigated both analytically and numerically by making use of the time dependent Ginzburg-Landau equation for the case of a scalar order parameter in a one-dimensional system without the thermal noise. We find the following results in our model. (i) The interaction between the kink and the impurity is attractive. (ii) When the distance between the kink and the impurity is larger than the width of the kink, the motion of the kink is described by the logarithmic function of time. This is similar to the growth law of dynamics of kinks and anti-kinks [K. Kawasaki and T. Ohta : Physica 116A (1982) 573. ]. (iii) When the distance between the kink and the impurity is small, the distance decreases exponentially with time and finally the kink is pinned by the impurity. (iv) When the distance between the kink and the impurity is large, the order parameter field has the spiky defect at the impurity position.
社団法人日本物理学会の論文
1995-08-15