Formation of the Bielectron in a 2D System due to Spin-Orbit Interaction and Image Forces

TL;DR

This paper demonstrates that in a 2D quantum well, spin-orbit interaction combined with image forces can induce an effective attraction between electrons, leading to the formation of a bound bielectron state.

Contribution

It introduces a model showing how spin-orbit interaction and image forces together can cause electron pairing in 2D systems, a novel mechanism for bielectron formation.

Findings

Effective attraction overcomes Coulomb repulsion at attainable parameters

Bielectron formation is theoretically possible in 2D quantum wells

Spin-orbit interaction plays a crucial role in electron pairing

Abstract

It is shown that two electrons located in a quantum well near a metal electrode attract each other due to the spin-orbit interaction (SOI) of the Bychkov-Rashba type and the electrostatic image forces. Using the example of a simple model, it is shown that, with quite attainable values of the characteristic parameters of the system, the effective attraction caused by SOI prevails over the Coulomb repulsion, and the formation of a bielectron becomes possible.