Lateral electric field effects on quantum size confinement in cylindrical quantum dot under parabolic potential

Safwan, S.A.; Asmaa, A.S.; Meshed, Nagwa El; Hekmat, Maryam; El‐Sherbini, Th. M.; Allam, S. H.

doi:10.1016/j.spmi.2010.02.004

Cited by 14 publications

(5 citation statements)

References 30 publications

(29 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The electronic and optical properties in the core-shell nanostructures have been discussed [5][6][7][8][9][10]. The nonlinear optical properties of low-dimensional materials such as quantum dots and quantum wire have attracted much attention [11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Third-order harmonics generation in ZnS/CdSe/ZnS cylindrical nanoshells

Bahari¹,

Moghadam²

2013

Phys. Scr.

View full text Add to dashboard Cite

Third-order harmonics generation (THG) has been investigated for ZnS/CdSe/ZnS nanoshell structure. Numerical calculations show that THG susceptibility has two peaks and depends on the parameters such as the size and the kind of structure, the relaxation time and the pump photon energy. The intensity and position of third-order nonlinear susceptibility peaks depend on shell thicknesses; smaller thickness have peak susceptibility at shorter wavelengths.

show abstract

Section: Introductionmentioning

confidence: 99%

Third-order harmonics generation in ZnS/CdSe/ZnS cylindrical nanoshells

Bahari¹,

Moghadam²

2013

Phys. Scr.

View full text Add to dashboard Cite

show abstract

“…In recent years, due to rapid advances in manufacturing technology, semiconductor structures, especially quantum dots (QDs), have garnered considerable interest [1][2][3][4][5]. Because of their special structure, semiconductor QDs exhibit unique physical properties not found in traditional materials, such as the quantum local effect [6,7], quantum tunneling effect [8], surface effect [9], quantum size effect [10,11] and Coulomb blocking effect [12]. These properties open up a range of applications in photovoltaics, photonics and optoelectronic devices such as light-emitting diodes, electro-optical modulators, far-infrared photodetectors and semiconductor optical amplifiers, all of which hold significant research value [13][14][15][16][17].…”

Section: Introductionmentioning

confidence: 99%

Optical third-harmonic generation of spherical quantum dots under inversely quadratic Hellmann plus inversely quadratic potential

Wang,

2024

Commun. Theor. Phys.

View full text Add to dashboard Cite

The third harmonic generation (THG) coefficient for the spherical quantum dot (QD) system with Inversely Quadratic Hellmann Plus Inversely Quadratic Potential (IQHIQP) is investigated theoretically, considering the regulation of the quantum size, confinement potential depth and external environment. The numerical simulation results indicate that the THG coefficient can reach the order of 10-12 m2/V2, which strongly relies on the tunable factor, with its resonant peak experiencing a red-shift or blue-shift. Interestingly, the effect of temperature on the THG coefficient in terms of peak location and size is consistent with the quantum dot radius but contrasts with the hydrostatic pressure. Thus, it is crucial to focus on the influence of internal and external parameters on nonlinear optical effects, and to implement the theory in practical experiments and the manufacture of optoelectronic devices.

show abstract

“…The influence of external factors on the binding energies of the impurity states in semiconductor nanostructures has been examined by many researchers from both the theoretical and technological points of view. In this regard, many studies have been performed to explore the dependence of the binding energy in these systems on electric fields [7][8][9][10], magnetic fields [11][12][13][14][15], their combined effects [16] and hydrostatic pressure [17,18]. These studies considered different confinement potentials shapes, and different directions of external electric fields were examined to show how the donor binding energy behaves as a function of an external electric field [19][20][21][22].…”

Section: Introductionmentioning

confidence: 99%

Effect of tilted electric field on stability of excited states of neutral donor impurity in semiconductor quantum wire

Safwan¹,

Meshad²,

Saleh³

et al. 2020

Phys. Scr.

View full text Add to dashboard Cite

The influence of the tilted electric field on the stability of the excited states of neutral donor impurity (D0) in a cylindrical quantum wire (CQW) is investigated. We consider the finite parabolic confinement potential in the CQW. The energies and wave functions for the on- and off-center D0 states are calculated using the variational principle within the single-band effective mass approximation. Moreover, the dependence of Stark shift ΔE in the ground and excited state energies of D0 on the tilted electric field are obtained. The tilted electric field strength is found to have a certain angle at which the states of D0 turn from bound to unbound. For the off-center donor impurity in the intermediate region of the angle, the binding energy of D0 descends rapidly in both the strong and weak confinement regions, and it increases again in the limit of the total lateral electric field. Moreover, our results show a reordering of the on- and off-center D0 energy states when moving from the strong confinement region towards the weak confinement region. The ground state of the off-center D0 loses its stability, faster in the tilted electric field than both the normal and the total lateral electric fields. The Stark shift in D0 shows a blue shift, and in some states of D0, it increases quadratically with the enhancement in the tilted electric field.

show abstract

Lateral electric field effects on quantum size confinement in cylindrical quantum dot under parabolic potential

Cited by 14 publications

References 30 publications

Third-order harmonics generation in ZnS/CdSe/ZnS cylindrical nanoshells

Third-order harmonics generation in ZnS/CdSe/ZnS cylindrical nanoshells

Optical third-harmonic generation of spherical quantum dots under inversely quadratic Hellmann plus inversely quadratic potential

Effect of tilted electric field on stability of excited states of neutral donor impurity in semiconductor quantum wire

Contact Info

Product

Resources

About