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Open Access Nano Express

Double-donor complex in vertically coupled quantum dots in a threading magnetic field

Ramón Manjarres-García1, Gene Elizabeth Escorcia-Salas1, Javier Manjarres-Torres1, Ilia D Mikhailov2 and José Sierra-Ortega1*

Author Affiliations

1 Group of Investigation in Condensed Matter Theory, Universidad del Magdalena, Santa Marta, Colombia

2 Universidad Industrial de Santander, A. A. 678, Bucaramanga, Colombia

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Nanoscale Research Letters 2012, 7:531  doi:10.1186/1556-276X-7-531

Published: 26 September 2012

Abstract

We consider a model of hydrogen-like artificial molecule formed by two vertically coupled quantum dots in the shape of axially symmetrical thin layers with on-axis single donor impurity in each of them and with the magnetic field directed along the symmetry axis. We present numerical results for energies of some low-lying levels as functions of the magnetic field applied along the symmetry axis for different quantum dot heights, radii, and separations between them. The evolution of the Aharonov-Bohm oscillations of the energy levels with the increase of the separation between dots is analyzed.

Keywords:
Quantum dots; Adiabatic approximation; Artificial molecule; PACS; 78.67.-n; 78.67.Hc; 73.21.-b