Double-donor complex in vertically coupled quantum dots in a threading magnetic field
1 Group of Investigation in Condensed Matter Theory, Universidad del Magdalena, Santa Marta, Colombia
2 Universidad Industrial de Santander, A. A. 678, Bucaramanga, Colombia
Nanoscale Research Letters 2012, 7:531 doi:10.1186/1556-276X-7-531Published: 26 September 2012
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.