Correlated few-electron states in vertical double-quantum-dot systems

TL;DR

This paper explores how high magnetic fields, electrostatic confinement, and inter-dot coupling create novel few-electron ground states in vertical double quantum dots, highlighting the significance of isospin alongside spin.

Contribution

It introduces a detailed analysis of the combined effects leading to new ground states in double quantum dots, emphasizing the role of isospin in these phenomena.

Findings

Identification of new ground states absent in single quantum dots

Analysis of isospin's role in ground state formation

Comparison between isospin and spin effects in quantum dots

Abstract

The electronic properties of semiconductor, vertical, double quantum dot systems with few electrons are investigated by means of analytic, configuration-interaction, and mean-field methods. The combined effect of a high magnetic field, electrostatic confinement, and inter-dot coupling, induces a new class of few-electron ground states absent in single quantum dots. In particular, the role played by the isospin (or quantum dot index) in determining the appearance of new ground states is analyzed and compared with the role played by the standard spin.