  We study a strongly interacting, fermionic fluid in the presence of an
applied magnetic field using a holographic framework. At low temperatures,
translation symmetry is spontaneously broken and the resulting phase is a
striped Hall fluid. Due to the magnetic field, an electric field applied
parallel to the stripes causes the stripes to slide, a phenomenon we coin "Hall
sliding." We also investigate the magneto-transport of the system in the
presence of an explicit translation symmetry-breaking lattice which pins the
stripes. Electrical properties are well represented by a hydrodynamical model,
which gives us further insight into particle-like cyclotron and
pseudo-Goldstone excitations we observe. The DC conductivities obey a novel
semi-circle law, which we derive analytically in the translationally invariant
ground state at low temperature.
