  We construct a periodically time-dependent Hamiltonian with a phase
transition in the quantum Hall universality class. One spatial dimension can be
eliminated by introducing a second incommensurate driving frequency, so that we
can study the quantum Hall effect in a one-dimensional (1D) system. This
reduction to 1D is very efficient computationally and would make it possible to
perform experiments on the 2D quantum Hall effect using cold atoms in a 1D
optical lattice.
