Landau-Zener tunneling in 2D periodic structures in the presence of a gauge field II: Electric breakdown

TL;DR

This paper investigates how Landau-Zener tunneling affects electric breakdown in 2D lattice systems with gauge fields, revealing that the presence of a gauge field alters the tunneling behavior and current flow.

Contribution

It demonstrates that in the presence of a gauge field, traditional electric breakdown via Landau-Zener tunneling does not occur, but instead results in a transverse current.

Findings

Electric breakdown is absent with a gauge field.

Landau-Zener tunneling induces a transverse current.

The dynamics differ significantly from the zero gauge field case.

Abstract

We analyze 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 tunneling, 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 tunneling leads to appearance of a finite current which flows in the direction orthogonal to the vector of a potential (electric) field.