The effect of barrier width on the electronic properties of double GaAlAs/GaAs and GaInAs/GaAs quantum wells

Ozturk, O.; Öztürk, Emine; Elagöz, S.

doi:10.1016/j.molstruc.2017.12.012

Cited by 16 publications

(7 citation statements)

References 35 publications

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“…Next, the compact-density-matrix method and the iterative procedure are used to derive the OACs and RICs in morse potential QWs. The analytical expressions of the linear and the third-order nonlinear susceptibilities for a two-level quantum system are given as follows [ 7 , 8 , 9 , 10 ]. First, for the linear term,

…”

Section: Theorymentioning

confidence: 99%

“…Recently, the linear and NLO properties of dimensionality semiconductor nanostructures have become an essential and exciting field in physics. Optical absorption coefficients (OACs) and refractive index changes (RICs) in quantum well (QW) systems have attracted much attention [ 7 , 8 , 9 , 10 ]. It is well known that the linear and NLO properties can be affected by applied magnetic fields, applied electric fields, temperature and their combinations, which can tune the band gap of dimensionality semiconductor nanostructures; thereby, the change in optical properties may be applied to opto-electronic and electro devices.…”

Section: Introductionmentioning

confidence: 99%

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The Combined Influence of Hydrostatic Pressure and Temperature on Nonlinear Optical Properties of GaAs/Ga0.7Al0.3As Morse Quantum Well in the Presence of an Applied Magnetic Field

2018

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Studies aimed at understanding the nonlinear optical (NLO) properties of GaAs/Ga0.7Al0.3As morse quantum well (QW) have focused on the intersubband optical absorption coefficients (OACs) and refractive index changes (RICs). These studies have taken two complimentary approaches: (1) The compact-density-matrix approach and iterative method have been used to obtain the expressions of OACs and RICs in morse QW. (2) Finite difference techniques have been used to obtain energy eigenvalues and their corresponding eigenfunctions of GaAs/Ga0.7Al0.3As morse QW under an applied magnetic field, hydrostatic pressure, and temperature. Our results show that the hydrostatic pressure and magnetic field have a significant influence on the position and the magnitude of the resonant peaks of the nonlinear OACs and RICs. Simultaneously, a saturation case is observed on the total absorption spectrum, which is modulated by the hydrostatic pressure and magnetic field. Physical reasons have been analyzed in depth.

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…”

Section: Theorymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The Combined Influence of Hydrostatic Pressure and Temperature on Nonlinear Optical Properties of GaAs/Ga0.7Al0.3As Morse Quantum Well in the Presence of an Applied Magnetic Field

2018

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“…Discontinuity on the edge of the conduction band and the electron effective mass depending on the material composition of Ga 1−x Al x As/GaAs [48][49][50] structure are analyzed using the following equations.…”

Section: Theorymentioning

confidence: 99%

Linear and nonlinear optical properties of asymmetric triple quantum wells under intense laser field

Ozturk¹,

Öztürk²,

Elagöz³

2019

Laser Phys.

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For asymmetric triple quantum wells (ATQW) the linear and nonlinear optical absorption coefficient (OAC) and the optical refractive index change (ORIC) are analyzed according to the intense laser field (ILF). The obtained results show that the ILF parameter (α 0 ) has an important effect on the shape and height of the confined potential profile of the ATQW, and alterations in the energy levels and the dipole moment matrix elements depend on the shape of the confinement potential. For α 0 = 10 nm (according to the parameters used in this study), ATQW turns into an asymmetric wider double confinement potential. As a consequence of the energy difference between the energy states, the absorption spectrum of (1-2) and (1-3) optical transitions initially shows a redshift (up to α 0 = 6 nm and α 0 = 4 nm, respectively) and then indicates a blueshift by increasing the ILF. For the (2-3) transition, the optical absorption spectrum continuously shows a blueshift and displays an oncoming shift toward the higher energies. Thus, the linear and nonlinear OAC and ORIC may be adjusted by modifying the ILF parameter. Our results are of use in the investigation into new ways of manipulating the optoelectronic properties of triple quantum well devices. Highlights• The electronic and optical properties of ATQW vary with increasing ILF value.• The effect of ILF on the quantum well (QW) differs depending on the shape of the QW.• OAC and ORIC change with rising ILF.• The absorption spectrum shows blueshifts or redshifts depending on the ILF.

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“…This kind of an asymmetry in potential shape may be acquired either by regularly grading quantum well (QW) or applying an electric field to a symmetric QW. The different shaped QWs [3][4][5][6], such as parabolic QWs [7][8][9][10][11][12] and inverse parabolic QWs [11][12][13][14][15][16][17] are well known. By altering QW potential shape, both the energy levels (ELs) and their wave-function modify, and numerous physical characteristics modify suitably.…”

Section: Introductionmentioning

confidence: 99%

Depending on the intense laser field of the nonlinear optical rectification, second and third harmonic generation in asymmetric parabolic-step and inverse parabolic-step quantum wells

2019

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The nonlinear optical rectification (NOR), the second harmonic generation (SHG) and the third harmonic generation (THG) coefficients in asymmetric parabolic-step quantum wells (APSQW) and asymmetric inverse parabolic-step quantum wells (AIPSQW) are considered as depending on the intense laser field (ILF). The found consequences indicate that ILF parameter approves a dynamic influence on the shape, width and height of the confined potential profile of both APSQW and AIPSQW, and the alterations of the dipole moment matrix elements and the energy levels (ELs) are followed on the profile of the confined potential. The potential profile and height of the AIPSQW compared to APSQW were affected differently from ILF intensity. With and without the ILF, the ELs in the APSQW are smaller than in the AIPSQW. These results designate that NOR, SHG, and THG coefficient of APSQW and AIPSQW may be controlled in a chosen energy range and the magnitude of the resonance peak (RP) by increasing ILF value. By modifying the ILF parameter, it is possible to classify red or blue shifts at the RP positions of the NOR, SHG and THG coefficients. We hope that our results will offer significant development of optical devices in many potential device applications for the appropriate selection of ILF values.

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The effect of barrier width on the electronic properties of double GaAlAs/GaAs and GaInAs/GaAs quantum wells

Cited by 16 publications

References 35 publications

The Combined Influence of Hydrostatic Pressure and Temperature on Nonlinear Optical Properties of GaAs/Ga0.7Al0.3As Morse Quantum Well in the Presence of an Applied Magnetic Field

The Combined Influence of Hydrostatic Pressure and Temperature on Nonlinear Optical Properties of GaAs/Ga0.7Al0.3As Morse Quantum Well in the Presence of an Applied Magnetic Field

Linear and nonlinear optical properties of asymmetric triple quantum wells under intense laser field

Depending on the intense laser field of the nonlinear optical rectification, second and third harmonic generation in asymmetric parabolic-step and inverse parabolic-step quantum wells

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