Inducement and suppression of Coulomb effects in elastic 2D-2D electron tunnelling in a quantizing magnetic field

TL;DR

This paper investigates how Coulomb interactions influence electron tunnelling between two 2D systems in a magnetic field, revealing the presence and disappearance of Coulomb pseudogap effects at different field strengths.

Contribution

It demonstrates the modulation of Coulomb pseudogap effects on tunnelling conductance peaks in 2D electron systems under varying magnetic fields.

Findings

Satellite conductance peaks are observed due to impurity-assisted tunnelling.

Coulomb pseudogap causes a shift of peaks to higher voltage in intermediate fields.

Pseudogap effects disappear at high magnetic fields.

Abstract

Tunnelling between two-dimensional electron systems has been studied in the magnetic field perpendicular to the systems planes. The satellite conductance peaks of the main resonance have been observed due to the electron tunnelling assisted by the elastic scattering on impurities in the barrier layer. These peaks are shown to shift to the higher voltage due to the Coulomb pseudogap in the intermediate fields. In the high magnetic fields the pseudogap shift is disappeared.