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Variational Calculation for Triangular Quantum Wells Using Modified Trial Wave Function

100%
Pödör B.
Acta Physica Polonica A
|
1995
|
vol. 88
|
issue 5
869-872
EN
In calculations involving triangular quantum wells the Fang-Howard variational wave function is widely used because of its simplicity, although it can lead to substantial errors. This can also occur in transport calculations, where the scattering rate, being proportional to the integral of the fourth power of the wave function, depends strongly on the shape of the wave function. A new set of one-parameter wave functions is introduced and the relaxation time is evaluated for short range scatterers. The improved wave function leads up to about 22 per cent increase in the scattering rate, and to a comparable decrease in the relaxation time.
2
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Photoluminescence and Double-Crystal X-Ray Study of InGaAs/InP: Effect of Rare Earth (Dysprosium) Addition During Liquid Phase Epitaxial Growth

51%
Pödör B., Csontos L., Somogyi K., Vignaud D.
Acta Physica Polonica A
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1995
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vol. 87
|
issue 2
465-468
EN
High purity In_{0.53}Ga_{0.47}As layers were grown on semi-insulating InP:Fe substrates by liquid phase epitaxy by adding small amounts of dysprosium (rare earth) to the melt. Hall effect and photoluminescence measurements showed that the addition of Dy strongly reduced the carrier and residual donor concentration, with a concurrent shift of the excitonic luminescence toward higher energies. The observed effects are ascribed to the gettering of residual donor impurities in the melt by Dy, as well as to the effects of possible incorporation of Dy into the grown layers.
3
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Crystallization in InGaAs/InP Heterostructures with a Strong Disorder

39%
Kovács G., Remenyi G., Gombos G., Savel'ev I. G., Kreshchuk A. M., Hegman N., Pödör B.
Acta Physica Polonica A
|
1995
|
vol. 88
|
issue 4
783-786
EN
Non-linear current-voltage characteristics were observed in the range of filling factors of 0.3 ≤ v ≤ 0.4 in a two-dimensional electron system in InGaAs/InP heterostructures with a strong disorder. The observations are explained qualitatively in terms of magnetic field induced localization and Wigner solidification.
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