The Liouville equation for singular ergodic magnetic Schr\"odinger   operators
  We study the time evolution of a density matrix in a quantum mechanical system described by an ergodic magnetic Schr\"odinger operator with singular magnetic and electric potentials, the electric field being introduced adiabatically. We construct a unitary propagator that solves weakly the corresponding time-dependent Schr\"odinger equation, and solve a Liouville equation in an appropriate Hilbert space. 
Yang Kang, Abel Klein