Supersymmetric Janus solutions in four dimensions

We use maximal gauged supergravity in four dimensions to construct the gravity dual of a class of supersymmetric conformal interfaces in the theory on the worldvolume of multiple M2-branes. We study three classes of examples in which the (1 + 1)dimensional defects preserve (4, 4), (0, 2) or (0, 1) supersymmetry. Many of the solutions have the maximally supersymmetric AdS(4) vacuum dual to the N = 8 ABJM theory on both sides of the interface. We also find new special classes of solutions including one that interpolates between the maximally supersymmetric vacuum and a conformal fixed point with N = 1 supersymmetry and G(2) global symmetry. We find another solution that interpolates between two distinct conformal fixed points with N = 1 supersymmetry and G(2) global symmetry. In eleven dimensions, this G(2) to G(2) solution corresponds to a domain wall across which a magnetic flux reverses orientation.