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We study an $SO(2)\times SO(2)\times SO(2)\times SO(2)$ truncation offour-dimensional $N=4$ gauged supergravity coupled to six vector multipletswith $SO(4)\times SO(4)$ gauge group and find a new class of holographic RGflows and supersymmetric Janus solutions. In this truncation, there is a unique$N=4$ supersymmetric $AdS_4$ vacuum dual to an $N=4$ SCFT in three dimensions.In the presence of the axion, the RG flows generally preserve $N=2$supersymmetry while the supersymmetry is enhanced to $N=4$ for vanishing axion.We find solutions interpolating between the $AdS_4$ vacuum and singulargeometries with different residual symmetries. We also show that all thesingularities are physically acceptable within the framework offour-dimensional gauged supergravity. Accordingly, the solutions areholographically dual to RG flows from the $N=4$ SCFT to a number ofnon-conformal phases in the IR. We also find $N=4$ and $N=2$ Janus solutionswith $SO(4)\times SO(4)$ and $SO(2)\times SO(2)\times SO(3)\times SO(2)$symmetries, respectively. The former is obtained from a truncation of allscalars from vector multiplets and can be regarded as a solution of pure $N=4$gauged supergravity. On the other hand, the latter is a genuine solution of thefull matter-coupled theory. These solutions describe conformal interfaces inthe $N=4$ SCFT with $N=(4,0)$ and $N=(2,0)$ supersymmetries.

Holographic RG flows and Janus solutions from matter-coupled N=4 gauged supergravity