## Logarithm of |Ψ(*x*, *y*, *t*)|^{2} at *t* = 10 000

figure

posted on 13.06.2013, 00:00 by D N Maksimov, I Yu Chesnokov, D V Makarov, A R Kolovsky**Figure 6.** Logarithm of |Ψ(*x*, *y*, *t*)|^{2} at *t* = 10 000. Parameters are *v _{x}* =

*v*= 0.5, α = 1/8 (

_{y}*B*≈ 0.02),

*F*= 0.015 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.