A simulation of intersubband absorption in ZnO/MgxZn1−xO quantum wells with an external electric field

Zhu, Jun; Ban, S. L.; Ha, S. H.

doi:10.1016/j.spmi.2012.11.011

Cited by 25 publications

(4 citation statements)

References 24 publications

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“…Various confined potential profiles of quantum wells have been studied, including triangular, parabolic, semi-parabolic, inverse parabolic [14], Gaussian potential [15], and semi-Vshaped quantum wells [16], among others. The impact of symmetry and asymmetry has also been examined, either under the application of electric and magnetic fields or solely under an electric field [17][18][19][20][21]. Several authors have evaluated the response of specific structures, based on intersubband transitions, to electromagnetic radiation in the terahertz range.…”

Section: Introductionmentioning

confidence: 99%

Effects of the Magnetic Field and Thickness of Layers on Intersubband Absorption in Asymmetric Double Parabolic Quantum Wells

Sebbar,

Boudjema,

Boukaoud

et al. 2023

MMEP

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This numerical study scrutinizes the impact of both the thickness of layers and an externally applied magnetic field on the optical absorption coefficient and alterations in the refractive index pertaining to the intersubband optical transition (1-2) within an asymmetric double parabolic structure, utilizing GaAs/AlGaAs quantum wells as a basis. Energy levels and their corresponding wave functions have been ascertained through the use of the shooting method. The findings of this investigation suggest a pronounced sensitivity of the optical absorption coefficient and changes in the refractive index to the thickness of the layers and the applied external magnetic field. It has been observed that the intensification of the magnetic field results in a resonant peak position shifting towards higher energy values, whereas the thickness of the layers exerts an influence on the resonance peak magnitude. The insights derived from this study hold considerable potential for application, particularly in the development of optical devices predicated on intersubband electronic transitions.

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Section: Introductionmentioning

confidence: 99%

Effects of the Magnetic Field and Thickness of Layers on Intersubband Absorption in Asymmetric Double Parabolic Quantum Wells

Sebbar,

Boudjema,

Boukaoud

et al. 2023

MMEP

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show abstract

“…Several years ago, the ISBTs in square and triangle DQWs with three energy levels for different electric fields were calculated. [14,15] The results showed that intersubband optical absorption coefficients (IOACs) and the energy levels can be modulated by external field strength. Recently, it was found that IOACs and incident photon energies are strongly affected not only by the magnitudes of the electric and magnetic fields but also by the structure parameters of the systems.…”

Section: Introductionmentioning

confidence: 99%

Intersubband optical absorption of electrons in double parabolic quantum wells of Al _x Ga _{1−
x} As/Al _y Ga _{1−
y}

Ma
¹
,

Yuan
²
,

S
³

2018

Chinese Phys. B

8
0
4
0

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Some realizable structures of double parabolic quantum wells (DPQWs) consisting of Al x Ga 1−x As /Al y Ga 1−y As are constructed to discuss theoretically the optical absorption due to the intersubband transition of electrons for both symmetric and asymmetric cases with three energy levels of conduction bands. The electronic states in these structures are obtained using a finite element difference method. Based on a compact density matrix approach, the optical absorption induced by intersubband transition of electrons at room temperature is discussed. The results reveal that the peak positions and heights of intersubband optical absorption coefficients (IOACs) of DPQWs are sensitive to the barrier thickness, depending on Al component. Furthermore, external electric fields result in the decrease of peak, and play an important role in the blue shifts of absorption spectra due to electrons excited from ground state to the first and second excited states. It is found that the peaks of IOACs are smaller in asymmetric DPQWs than in symmetric ones. The results also indicate that the adjustable extent of incident photon energy for DPQW is larger than for a square one of a similar size. Our results are helpful in experiments and device fabrication.

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“…Recently, the intersubband absorption properties of ZnO=MgZnO quantum wells (QWs) were investigated, and clear intersubband absorptions in the mid-infrared spectral region were observed. [15][16][17] However, to our knowledge, there are no reports on ZnO=MgZnO-based QCDs. In addition to a wide range of conduction-band offsets, the larger ionicity of ZnO ensures a shorter carrier lifetime and thus a higher response speed compared with III-V materials.…”

mentioning
confidence: 99%

“…To solve the 2D Schrödinger-Poisson equation self-consistently and obtain the band structures of the QCD at different biases and temperatures, the Fermi energy as a function of the bias voltage and temperature is derived from the condition of charge neutrality. 17) The Fermi energy at the electrode applied zero bias is shown in Fig. 2.…”

mentioning
confidence: 99%

Study on temperature effect on properties of ZnO/MgZnO based quantum cascade detector in mid-infrared region
He
¹
,
Wang
²
,
Chen
³

et al. 2016
Appl. Phys. Express
20
0
8
0
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The effect of temperature on a ZnO/Mg0.3Zn0.7O quantum cascade detector (QCD) in the mid-infrared region is investigated with consideration of bound-to-bound electronic-transport processes in the dark and under illumination. The temperature-dependent band structures of the QCD system, which comprises four quantum wells and five barriers in one period, are numerically calculated. The electronic transition is obtained with a standard electron-optical phonon Hamiltonian, and the photon absorption is described by the two-dimensional absorption coefficient. The responsivity of the ZnO/Mg0.3Zn0.7O QCD shows a good temperature stability without an obvious redshift, and the peak responsivity decreases by only 14% when the temperature increases from 50 to 300 K.

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A simulation of intersubband absorption in ZnO/MgxZn1−xO quantum wells with an external electric field

Cited by 25 publications

References 24 publications

Effects of the Magnetic Field and Thickness of Layers on Intersubband Absorption in Asymmetric Double Parabolic Quantum Wells

Effects of the Magnetic Field and Thickness of Layers on Intersubband Absorption in Asymmetric Double Parabolic Quantum Wells

Intersubband optical absorption of electrons in double parabolic quantum wells of Al _x Ga _{1−
x} As/Al _y Ga _{1−
y}

Study on temperature effect on properties of ZnO/MgZnO based quantum cascade detector in mid-infrared region

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A simulation of intersubband absorption in ZnO/MgxZn1−xO quantum wells with an external electric field

Cited by 25 publications

References 24 publications

Effects of the Magnetic Field and Thickness of Layers on Intersubband Absorption in Asymmetric Double Parabolic Quantum Wells

Effects of the Magnetic Field and Thickness of Layers on Intersubband Absorption in Asymmetric Double Parabolic Quantum Wells

Intersubband optical absorption of electrons in double parabolic quantum wells of Al x Ga 1− x As/Al y Ga 1− y

Study on temperature effect on properties of ZnO/MgZnO based quantum cascade detector in mid-infrared region

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Intersubband optical absorption of electrons in double parabolic quantum wells of Al _x Ga _{1−
x} As/Al _y Ga _{1−
y}