Abstract
We consider Landau-Ginzburg models with possibly different superpotentials glued together along one-dimensional defect lines. Defects preserving B-type supersymmetry can be represented by matrix factorisations of the difference of the superpotentials. The composition of these defects and their action on B-type boundary conditions is described in this framework. The cases of Landau-Ginzburg models with superpotential W = Xd and W = Xd+Z2are analysed in detail, and the results are compared to the CFT treatment of defects in N = 2 superconformal minimal models to which these Landau-Ginzburg models flow in the IR.
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