# Classical trajectories of ten particles with random initial conditions in the central potential well

**Figure 5.** Classical trajectories of ten particles with random initial conditions in the central potential well. Parameters are *v _{x}* =

*v*= 0.5,

_{y}*B*= 0.02,

*F*= 0.02 and

_{y}*F*= 0.

_{x}**Abstract**

We analyse dynamics of a quantum particle in a square lattice in the Hall configuration beyond the single-band approximation. For vanishing gauge (magnetic) field this dynamics is defined by the inter-band Landau–Zener tunnelling, which is responsible for the phenomenon known as the electric breakdown. We show that in the presence of a gauge field this phenomenon is absent, at least, in its common sense. Instead, the Landau–Zener tunnelling leads to the appearance of a finite current which flows in the direction orthogonal to the vector of a potential (electric) field.