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Electron scattering off an Anderson impurity immersed in the bulk of a 3Dtopological insulator is studied in the strong coupling regime, where thetemperature $T$ is lower than the Kondo temperature $T_K$. The system displayseither a self-screened Kondo effect, or a Kondo effect with SO(3) or SO(4)dynamical symmetries. Low temperature Kondo scattering for systems with SO(3)symmetry displays the behavior of a singular Fermi liquid, an elusive propertythat so far has been observed only in tunneling experiments. This isdemonstrated through the singular behavior as $T \to 0$ of the specific heat,magnetic susceptibility and impurity resistivity, that are calculated usingwell known (slightly adapted) conformal field theory techniques. Quitegenerally, the low temperature dependence of some of these observables displaysa remarkable distinction between the SO(n=3,4) Kondo effect, compared with thestandard SU(2) one.

Anderson Impurity in the Bulk of 3D Topological Insulators: II. The Strong Coupling Regime