States of an on-axis two-hydrogenic-impurity complex in concentric double quantum rings

• Published in: Physics letters. A Vol. 378; no. 30-31; pp. 2297 - 2302
• Main Authors: R-Fulla, M., Marín, J.H., Suaza, Y.A., Duque, C.A., Mora-Ramos, M.E.
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 13-06-2014
• Subjects: Atomic structure; Dissociation energy; Double donors; Equilibrium length; Gallium arsenide; Hydrostatic pressure; Magnetic fields; Mathematical analysis; Quantum dots; Quantum oscillations; Quantum rings; Rotational; Solid state physics; Turning point; Quantum oscillations; Equilibrium length; Double donors; Dissociation energy; Turning point; Quantum rings
• ISSN: 0375-9601; 1873-2429
• DOI: 10.1016/j.physleta.2014.05.042

The energy structure of an on-axis two-donor system (D20) confined in GaAs concentric double quantum rings under the presence of magnetic field and hydrostatic pressure was analyzed. Based on structural data for the double quantum ring morphology, a rigorous adiabatic procedure was implemented to separate the electrons' rapid in-plane motions from the slow rotational ones. A one-dimensional equation with an effective angular-dependent potential, which describes the two-electron rotations around the common symmetry axis of quantum rings was obtained. It was shown that D20 complex characteristic features are strongly dependent on the quantum ring geometrical parameters. Besides, by changing the hydrostatic pressure and magnetic field strengths, it is possible to tune the D20 energy structure. Our results are comparable to those previously reported for a single and negative ionized donor in a spherical quantum dot after a selective setting of the geometrical parameters of the structure.
•We report the eigenenergies of a D20 complex in concentric double quantum rings.•Our model is versatile enough to analyze the dissociation process D20→D0+D++e−.•We compare the D0 eigenenergies in horn toroidal and spherical shaped quantum dots.•We show the effects of hydrostatic pressure and magnetic field on the D20 spectrum.•The use of hydrostatic pressure provides higher thermal stability to the D20 complex.