Abstract
The probability for Bragg reflections of wave packets in a lattice and an external electric fieldF is no longer invariant against inversion: (a) Reflections anti-parallel toF are favored compared to reflections parallel toF owing to the energy gain involved. (b) Reflection amplitudes caused in successive cyclotron periods cancel by interference, except when the respective energy gain equals an integer number of magnetic quanta. The effective current parallel toF is calculated up to terms of second order in the lattice potential. It is found proportional to 1/B 2 for scattering times shorter (low field limit) and proportional to 1/B for scattering times longer (high field limit) than one cyclotron period. The effect of magnetic breakdown interpolates between the results of a band model for closed and open electron orbits. From the reflection condition (b) one can deduct oscillations of the effective current inF/B 2 in the 1/B-region.
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