𝔖 Bobbio Scriptorium
✦   LIBER   ✦

Screening effect on the binding energies of shallow donors, acceptors and excitons in finite-barrier quantum wells

✍ Scribed by H. Akbaş; Ş. Aktaş; S.E. Okan; M. Ulaş; M. Tomak

Publisher
Elsevier Science
Year
1998
Tongue
English
Weight
78 KB
Volume
23
Category
Article
ISSN
0749-6036

No coin nor oath required. For personal study only.

✦ Synopsis

The conduction and valence subband energies in the presence of an electric field are calculated using the fifth-order Runge-Kutta method. The binding energies of shallow donors, acceptors and excitons in finite-barrier GaAs/Ga 1-x Al x As quantum wells are then obtained variationally in the presence of a magnetic field. The effects of a spatially dependent screening function ε(r ) on the calculation of binding energies are specifically investigated. The use of ε(r ) in comparison with the use of a constant ε 0 increases the binding energy of acceptors as the increase on shallow donors and excitons is quite small.

📜 SIMILAR VOLUMES

Screening effect on polarizabilities of
Screening effect on polarizabilities of shallow donors and acceptors in infinite-barrier quantum wells
✍ K.F. Ilaiwi 📂 Article 📅 1996 🏛 Elsevier Science 🌐 English ⚖ 254 KB

Polarizabilities of shallow donors and acceptors in infinite-barrier GaAs/Ga \V Al V As quantum wells have been calculated using the Hasse variational method within the effective mass approximation. The effect of spatially dependent screening on polarizabilities is taken into account with an r-depen

Exciton binding energy in a double quant
Exciton binding energy in a double quantum well: effect of the barrier shift
✍ K. Ryczko; G. Sek; J. Misiewicz 📂 Article 📅 2002 🏛 Elsevier Science 🌐 English ⚖ 218 KB

We have calculated the exciton binding energy in an Al x Ga 1-x As/GaAs double quantum well by a variational envelope function procedure using a simple two-band model. The influence of the shift of the AlAs separating barrier, introducing an asymmetry into the system, on the value of the exciton bin

Finite-Barrier Height Effect on the Magn
Finite-Barrier Height Effect on the Magnetoabsorption of a Shallow Donor in a Quantum Well Wire
✍ I. Zorkani; A. Mdaa; R. Elkhenifer 📂 Article 📅 1999 🏛 John Wiley and Sons 🌐 English ⚖ 155 KB 👁 3 views

We report a calculation of the absorption coefficient of donor impurities located at the center of a quasi-1D GaAs quantum well wire with finite confinement potential as a function of photon energies for different wire widths. The theory has been formulated by using suitable variational wave functio