Diamagnetic susceptibility of an artificial hydrogen molecule ion DD₂⁺ confined to quantum dots: effects of anisotropy

ABSTRACT

We present the numerical results obtained by the two-dimensional diagonalisation method concerning the anisotropy and internuclear distance dependence of the electronic structure, total energy and diamagnetic susceptibility of an artificial hydrogen molecule ion confined in the quantum dot (QD). We have demonstrated the existence of the tunability of the diamagnetic susceptibility and energy levels of the $D_2^{+}$ complex by adjusting the QD size, distance between the impurity atoms and the anisotropy of the QD. Consequently, results reveal that a precise tuning of the electronic states and diamagnetic susceptibility of the system can be achieved by proper control of the anisotropy.

KEYWORDS:

• Quantum dots
• $D_2^{+}$ complex
• anisotropy

Acknowledgments

CAD is grateful to the Colombian Agencies: CODI-Universidad de Antioquia (Estrategia de Sostenibilidad de la Universidad de Antioquia and projects ‘Propiedades magneto-ópticas y óptica no lineal en superredes de Grafeno’, ‘Estudio de propiedades ópticas en sistemas semiconductores de dimensiones nanoscópicas’, ‘Propiedades de transporte, espintrónicas y térmicas en el sistema molecular ZincPorfirina’, and ‘Complejos excitónicos y propiedades de transporte en sistemas nanométricos de semiconductores con simetríaxial’), and Facultad de Ciencias Exactas y Naturales-Universidad de Antioquia (CAD exclusive dedication project 2022-2023). CAD also acknowledges the financial support from El Patrimonio Autónomo Fondo Nacional de Financiamiento para la Ciencia, la Tecnología y la Innovación Francisco José de Caldas (project: CD 111580863338, CT FP80740-173-2019).

Data availability statement

All the files with tables, figures and codes are available. The corresponding author will provide all the files in case they are requested.

Disclosure statement

The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.