抄録
Dynamics of a kink in the presence of a quenched impurityis investigated both analytically and numerically by making use of thetime dependent Ginzburg-Landau equation for the case of a scalar orderparameter in a one-dimensional system without the thermal noise. Wefind the following results in our model. (i) The interaction betweenthe kink and the impurity is attractive. (ii) When the distancebetween the kink and the impurity is larger than the width of thekink, the motion of the kink is described by the logarithmic functionof time. This is similar to the growth law of dynamics of kinks andanti-kinks [K. Kawasaki and T. Ohta: Physica 116A (1982) 573.]. (iii)When the distance between the kink and the impurity is small, thedistance decreases exponentially with time and finally the kink ispinned by the impurity. (iv) When the distance between the kink andthe impurity is large, the order parameter field has the spiky defectat the impurity position.
