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Effects of electric field and hydrostatic pressure on donor binding energies in a spherical quantum dot

✍ Scribed by Sr.Gerardin Jayam; K. Navaneethakrishnan

Publisher
Elsevier Science
Year
2003
Tongue
English
Weight
127 KB
Volume
126
Category
Article
ISSN
0038-1098

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✦ Synopsis

The binding energies of a hydrogenic donor in a GaAs spherical quantum dot in the Ga 12x Al x As matrix are presented assuming parabolic confinement. Effects of hydrostatic pressure and electric field are discussed on the results obtained using a variational method. Effects of the spatial variation of the dielectric screening and the effective mass mismatch are also investigated. Our results show that (i) the ionization energy decreases with dot size, with the screening function giving uniformly larger values for dots which are less than about 25 nm, (ii) the hydrostatic pressure increases the donor ionization energy such that the variation is larger for a smaller dot, and (iii) the ionization energy decreases in an electric field. All the calculations have been carried out with finite barriers and good agreement is obtained with the results available in the literature in limiting cases.

πŸ“œ SIMILAR VOLUMES

Hydrostatic pressure and conduction band
Hydrostatic pressure and conduction band non-parabolicity effects on the impurity binding energy in a spherical quantum dot
✍ A. Sivakami; M. Mahendran πŸ“‚ Article πŸ“… 2010 πŸ› Elsevier Science 🌐 English βš– 191 KB

The binding energy of a shallow hydrogenic impurity in a spherical quantum dot under hydrostatic pressure with square well potential is calculated using a variational approach within the effective mass approximation. The effect of conduction band non-parabolicity on these energies is also estimated.