Abstract
The conduction band and electron-donor impurity states in elliptic-shaped GaAs quantum dots under the effect of an externally applied electric field are calculated within the effective mass and adiabatic approximations using two different numerical approaches: a spectral scheme and the finite element method. The resulting energies and wave functions become the basic information needed to evaluate the interstate optical absorption in the system, which is reported as a function of the geometry, the electric field strength, and the temperature.
Highlights
Semiconductor elliptical quantum dots (QDs) have been the subject of investigation for a number of years due to their prospective applications in optoelectronics
The upper row corresponds to conduction band states [graphics (a) and (b)], and the lower row contains the energies of electrons coupled to the donor impurity located at the elliptical QD center
In the present work we have addressed the calculation of the conduction band effective mass states of elliptically shaped quantum dots with finite and infinite confinement potentials, the presence of a donor impurity atom, and the influence of externally applied static electric fields
Summary
Semiconductor elliptical quantum dots (QDs) have been the subject of investigation for a number of years due to their prospective applications in optoelectronics. Recent works on electronics and optical properties in this kind of nanosystems can be referred to in [1,2,3,4,5,6,7,8,9,10] Among them it is worth highlighting, for instance, the practical realization of elliptical QDs in the InGaN/GaN system which can be used as single photon sources, allowing predefining photon states according to the QD orientation [9]. By using the adiabatic approximation, Gusev et al have reported the electronic structure in low dimensional systems, with parabolic and rectangular potential, including impurity and exciton states [13, 14] Their results are developed for quantum wells, wires, and dots, with particular spheroidal-shapes [14].
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