Stark-shift of impurity fundamental state in a lens shaped quantum dot

Aderras, L.; Bah, Abdellah; Feddi, E.; Dujardin, F.; Duque, C.A.

doi:10.1016/j.physe.2017.02.012

Cited by 21 publications

(9 citation statements)

References 29 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The quantum confined Stark effect is a well-known phenomenon that occurs when an electric field is added to a potential well. This phenomenon has piqued researchers to investigate the effect [1][2][3][4]. Two distinct characters of behaviour have been revealed.…”

Section: Introductionmentioning

confidence: 99%

A study of confined Stark effect, hydrostatic pressure and temperature on nonlinear optical properties in 1D GaxAl1-xAs/GaAs/GaxAl1-xAs quantum dots under a finite square well potential

Chaurasiya¹,

Dahiya²,

Sharma³

2023

Nanosystems: Phys. Chem. Math.

View full text Add to dashboard Cite

In the present paper, investigations of nonlinear optical rectification, absorption coefficient and refractive index in a 1D Ga x Al 1−x As/GaAs/Ga x Al 1−x As quantum dots under a finite square well potential using simulation software such as COMSOL Multi-Physics and Matlab have been carried out in the presence of electric field, hydrostatic pressure and temperature. Results show that the resonant peaks of ORC (optical rectification coefficient) exhibit a blue shift under increasing of the electric field, while a red shift trailed by a blue shift is displayed under increasing of hydrostatic pressure and temperature. Similar trends take place for the refractive index as well as for the absorption coefficient under changing of the electric field, temperature and hydrostatic pressure. The attained theoretical results would pave a novel opportunity in designing, optimizing and applications of nonlinear opto-electronic devices by tuning the performance of the quantum dots and controlling some of their specific properties. KEYWORDS confined Stark effect, quantum dot, second harmonic generation, third harmonic generation FOR CITATION Chaurasiya R., Dahiya S., Sharma R. A study of confined Stark effect, hydrostatic pressure and temperature on nonlinear optical properties in 1D Ga x Al 1−x As/GaAs/Ga x Al 1−x As quantum dots under a finite square well potential.

show abstract

Section: Introductionmentioning

confidence: 99%

A study of confined Stark effect, hydrostatic pressure and temperature on nonlinear optical properties in 1D GaxAl1-xAs/GaAs/GaxAl1-xAs quantum dots under a finite square well potential

Chaurasiya¹,

Dahiya²,

Sharma³

2023

Nanosystems: Phys. Chem. Math.

View full text Add to dashboard Cite

show abstract

“…This effect has been investigated by Elabsy [9] and Nithiananthi and Jayakumar [10] in a 𝐺𝑎𝐴𝑠/𝐺𝑎 1−𝑥 𝐴𝑙 𝑥 𝐴𝑠 quantum well, and Khordad [11] in a V-groove 𝐺𝑎𝐴𝑠/𝐺𝑎 1−𝑥 𝐴𝑙 𝑥 𝐴𝑠 quantum wire. Recently, the electronic properties were examined using different methods: Variational approach [12][13][14][15], finite element method [16,17], finite difference method [18], matrix diagonalization method [19] and density functional theory [20]. However, few papers have dealt with the electronic properties of multiple low-dimensional systems in the presence of a hydrogenic donor impurity [21][22][23][24].…”

Section: Introductionmentioning

confidence: 99%

Temperature-Related Electronic Low-Lying States in Different Shapes In.1Ga.9N/GaN Double Quantum Wells under Size Effects

Belaid

Ghazi²,

En-nadir³

et al. 2022

Trends Sci

View full text Add to dashboard Cite

In this paper, we report the electronic states of hydrogenic impurity in InGaN/GaN double quantum wells (DQWs) with different shapes using a numerical procedure within the effective mass approximation. The effects of temperature, impurity position and size on the 1S-, 2S- and 2P-low-lying states are investigated for rectangular, parabolic and triangular finite potential confinements. Our results reveal that the binding energy versus the well width displays a maximum value around the effective Bohr radius and a larger value is obtained for rectangular compared to parabolic and triangular profiles. Moreover, regardless the size and impurity’s position, it is found that the main impact of the temperature is to shrink the binding energy. It is obtained that the binding energy drop is about 3.48 meV for rectangular and 4.26 meV for both parabolic and triangular profiles. Moreover, as the impurity is moved from the right barrier center to the structure center, the 1S-binding energy improvement is about 77.6 % in rectangular whereas it exceeds 91.4 % for other profiles. It is established that the binding energy can be easily modulated by adjusting the temperature, structure size and impurity's position. The results we obtained agree quite well with the findings. HIGHLIGHTS The maximum binding energy is obtained around the effective Bohr radius The binding energy is higher for rectangular shape compared to parabolic and triangular ones The main impact of the temperature is to shrink the binding energy The binding energy is improved with displacing the impurity toward the structure center

show abstract

“…More recently, by using the effective mass and parabolic band approximations, they have determined analytically the energies of the fundamental and few low lying states of a single electron confined in a paraboloidal quantum lens [25]. They further studied the Stark effect and the polarizability of shallow-donor impurity located in the center of a lens-shaped QD by a variational method [26]. Many other properties for different shapes have been analyzed.…”

Section: Introductionmentioning

confidence: 99%

“…The electric field effect on QD semiconductors continues to attract much interest [26,[31][32][33][34][35][36][37][38][39]. It leads to the well-known effect, the quantum-confined Stark effect (QCSE), characterized by a red-shift many times greater than the electron-hole binding energy.…”

Section: Introductionmentioning

confidence: 99%

Quantum Confined Stark Effect on the Linear and Nonlinear Optical Properties of SiGe/Si Semi Oblate and Prolate Quantum Dots Grown in Si Wetting Layer

et al. 2021

View full text Add to dashboard Cite

We have studied the parallel and perpendicular electric field effects on the system of SiGe prolate and oblate quantum dots numerically, taking into account the wetting layer and quantum dot size effects. Using the effective-mass approximation in the two bands model, we computationally calculated the extensive variation of dipole matrix (DM) elements, bandgap and non-linear optical properties, including absorption coefficients, refractive index changes, second harmonic generation and third harmonic generation as a function of the electric field, wetting layer size and the size of the quantum dot. The redshift is observed for the non-linear optical properties with the increasing electric field and an increase in wetting layer thickness. The sensitivity to the electric field toward the shape of the quantum dot is also observed. This study is resourceful for all the researchers as it provides a pragmatic model by considering oblate and prolate shaped quantum dots by explaining the optical and electronic properties precisely, as a consequence of the confined stark shift and wetting layer.

show abstract

Stark-shift of impurity fundamental state in a lens shaped quantum dot

Cited by 21 publications

References 29 publications

A study of confined Stark effect, hydrostatic pressure and temperature on nonlinear optical properties in 1D GaxAl1-xAs/GaAs/GaxAl1-xAs quantum dots under a finite square well potential

A study of confined Stark effect, hydrostatic pressure and temperature on nonlinear optical properties in 1D GaxAl1-xAs/GaAs/GaxAl1-xAs quantum dots under a finite square well potential

Temperature-Related Electronic Low-Lying States in Different Shapes In.1Ga.9N/GaN Double Quantum Wells under Size Effects

Quantum Confined Stark Effect on the Linear and Nonlinear Optical Properties of SiGe/Si Semi Oblate and Prolate Quantum Dots Grown in Si Wetting Layer

Contact Info

Product

Resources

About