Temporal Oscillation of Conductances in Quantum Hall Effect of Bloch   Electrons
  We study a nonadiabatic effect on the conductances in the quantum Hall effect of two-dimensional electrons with a periodic potential. We found that the Hall and longitudinal conductances oscillate in time with a very large frequencies due to quantum fluctuation. 
Manabu Machida, Naomichi Hatano, and Jun Goryo