Intersubband Electron Interaction in 1D-2D Junctions

TL;DR

This paper investigates how electron interactions via Friedel oscillations in 1D-2D junctions influence transport, revealing significant backscattering effects that explain various experimental observations.

Contribution

It demonstrates that electron interactions caused by Friedel oscillations significantly affect transport in 1D-2D junctions, a novel insight into electron scattering mechanisms.

Findings

Backscattering peaks sharply at Fermi energy

Reflection coefficient can reach about 0.1

Explains several experimental phenomena

Abstract

We have shown that the electron transport through junctions of one-dimensional and two-dimensional systems, as well as through quantum point contacts, is considerably affected by the interaction of electrons of different subbands. The interaction mechanism is caused by Friedel oscillations, which are produced by electrons of the closed subbands even in smooth junctions. Because of the interaction with these oscillations, electrons of the open subbands experience a backscattering. The electron reflection coefficient, which describes the backscattering, has a sharp peak at the energy equal to the Fermi energy and may be as high as about 0.1. This result allows one to explain a number of available experimental facts.