Coulomb pseudogap in elastic 2D-2D electron tunneling in a quantizing magnetic field

TL;DR

This paper experimentally investigates the Coulomb pseudogap effect on elastic electron tunneling between two 2D electron gases in a magnetic field, revealing new insights into disorder-assisted tunneling phenomena.

Contribution

It presents the first experimental observation of the Coulomb pseudogap in elastic tunneling aided by disorder scattering in 2DEGs under magnetic fields.

Findings

Coulomb pseudogap suppresses tunneling at Fermi level

Disorder-assisted elastic tunneling reveals pseudogap effects

Experimental data supports theoretical predictions

Abstract

The electron tunneling is experimentally studied between two-dimensional electron gases (2DEGs) formed in a single-doped-barrier heterostructure in the magnetic fields directed perpendicular to the 2DEGs planes. It is well known that the quantizing magnetic field induces the Coulomb pseudogap suppressing the electron tunneling at Fermi level. In this paper we firstly present the experimental results revealing the pseudogap in the electron tunneling assisted by elastic electron scattering on disorder.