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Csavinszky, P.; Oyoko, H.

doi:10.1103/physrevb.43.9262

Cited by 28 publications

(21 citation statements)

References 18 publications

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“…It can be observed that the screening effect is more pronounced for d ≤ 0.38a*. We have found that the donor binding energies for the impurity located at the centre of the wire are nearly the same as the results of previous calculations [38,39].…”

Section: Resultssupporting

confidence: 81%

“…Csavinszky and Oyoko [38] have calculated the binding energies of on-axis hydrogenic and nonhydrogenic donors with zero electric field as a function of the radius of a GaAs-(Ga,Al)As QWW of circular cross-section, assuming the impurity located at the origin. They have found that both hydrogenic and non-hydrogenic binding energies of donor impurities are sensitive functions of the QWW radius and, for infinite barrier height, increase as the radius decreases.…”

Section: Introductionmentioning

confidence: 99%

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Electric field effect on the binding energy of a non‐hydrogenic donor impurity in a cylindrical cross‐sectional quantum well wire

Ulas

Cicek

Dalgic

2004

Physica Status Solidi (b)

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The effect of an electric field on the non-hydrogenic binding energy of a shallow donor impurity in a cylindrical cross-sectional GaAs-(Ga,Al)As quantum well wire (QWW) was investigated. Within the effective mass approximation, the non-hydrogenic binding energy of the donor impurity was calculated by a variational method as a function of the wire radius, donor impurity position and applied electric field. The results show that the non-hydrogenic binding energy of the donor impurity located around the centre is larger than that of the hydrogenic binding energy. The difference in binding energy of an on-centre shallow donor impurity in the two regimes increases more rapidly with decreasing QWW radius than for other impurity positions. It has been found that the sensitivity of the donor binding energies to the applied electric field in both regimes is almost the same.

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Section: Resultssupporting

confidence: 81%

Section: Introductionmentioning

confidence: 99%

Electric field effect on the binding energy of a non‐hydrogenic donor impurity in a cylindrical cross‐sectional quantum well wire

Ulas

Cicek

Dalgic

2004

Physica Status Solidi (b)

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“…While Fishman [17] investigated carrier transport in a QWW with dielectric screening (even including a temperature dependent screening), others [18] used only a Coulomb potential screened by the static dielectric constant. A few other investigators [3,5] showed that the dielectric screening does not lead to appreciable changes to the donor ionization energies as compared to results obtained using only a static dielectric constant. Hence it has become important to see if the above conclusions are due to a specific form of these screening functions used or the results could be modified using different screening functions.…”

Section: Introductionmentioning

confidence: 92%

“…Study of impurity states in a Quantum Well Wire (QWW) has drawn the attention of several investigators [1][2][3][4][5]. Various geometries like rectangular cross section [3] and circular cross section [1,5,6] have been considered.…”

Section: Introductionmentioning

confidence: 99%

“…Various geometries like rectangular cross section [3] and circular cross section [1,5,6] have been considered. Though the main interest in these investigations is to see how the carrier transport is enhanced under confined geometries, there are additional interests such as the possibility of 1D hydrogen atom, exciton in lower dimensions etc.…”

Section: Introductionmentioning

confidence: 99%

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Effect of dielectric screening on the binding energies and diamagnetic susceptibility of a donor in a quantum well wire

Latha¹,

Rajashabala²,

Navaneethakrishnan³

2006

Physica Status Solidi (b)

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The effect of the dielectric screening on donor binding energies in a quantum wire has been estimated. Since the screening function is shown to be significant in a few phenomena like carrier transport, and not so in a few cases like the donor binding energy calculations, five different screening functions have been used in the calculations to see their relative merits. It is observed that the dielectric function obtained by Resta using the Thomas -Fermi approximation not only gives lower estimates of the ionization energies for all well widths (L), but also is shown to vary very rapidly with L. The other functions used are those of Hermanson and Vinsome & Richardson. Using the results of the variational calculations for the finite barrier problem, the diamagnetic susceptibility of a donor as a function of L has also been estimated. Though experimental results are not available, we have compared our results for E ion with other theoretical estimates available in the literature. The agreement is found to be good.

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Combined effect of the screening of a donor ion and the conduction band nonparabolicity on the binding energy of a donor at the center of a spherical quantum dot

Elabsy¹,

Csavinszky²

1996

Int. J. Quantum Chem.

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rnWe carried out variational model calculations for the assessment of the combined effect of the nonparabolicity of the electron effective mass and the screening of the donor ion by the valence electrons of GaAs for a donor placed at the center of a spherical quantum dot. We considered finite confining potentials between the GaAs QD and the surrounding Ga,_,Al,As matrix. We found that the combined effect becomes more pronounced as the radius of the quantum dot decreases.

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Binding energy of on-axis hydrogenic and nonhydrogenic donors in a GaAs/Ga1−xA

Cited by 28 publications

References 18 publications

Electric field effect on the binding energy of a non‐hydrogenic donor impurity in a cylindrical cross‐sectional quantum well wire

Electric field effect on the binding energy of a non‐hydrogenic donor impurity in a cylindrical cross‐sectional quantum well wire

Effect of dielectric screening on the binding energies and diamagnetic susceptibility of a donor in a quantum well wire

Combined effect of the screening of a donor ion and the conduction band nonparabolicity on the binding energy of a donor at the center of a spherical quantum dot

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