Interband optical absorption in wurtzite MgxZn1−xO/ZnO/MgyZn1−yO asymmetric quantum wells

Gu, Zhennan; Zhu, Zhenye; Wang, M.M.; Wang, Y.Q.; Yuan, Quan; Ban, S. L.

doi:10.1016/j.spmi.2016.10.051

Cited by 8 publications

(6 citation statements)

References 24 publications

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“…q is the charge e (−e) of the electron (hole). V i are the confinement potential for the electron and hole in the z direction, and can be expressed as following according to the rule of 7 : 3 [18] V…”

Section: Theory and Modelmentioning

confidence: 99%

“…N D is the doping concentration at temperature T . [18] E f ,i is the Fermi energy and E D the donor energy level. And k B is the Boltzmann constant.…”

Section: Theory and Modelmentioning

confidence: 99%

“…For a wurtzite structure, the total polarization P tot k was described in detail in Ref. [18] For a zinc-blende structure, P tot k is just induced by the P pp k…”

Section: Theory and Modelmentioning

confidence: 99%

“…In 2011, Yu et al [17] investigated theoretically the OACs of ZnO/ZnMgO quantum wells by the fractional-dimensional space approach with consideration of exciton effects, and indicated that the peaks move to a lower energy. In 2017, Gu et al [18] calculated the OACs of electron interband transitions in wurtzite ZnO/ZnMgO quantum wells in consideration of built-in electric fields (BEFs) and the Hartree potential, and the effects of size and TMCs of OACs are also given. Recently, Song et al [19] investigated optical absorption of exciton transitions in a single QW by introducing a mixed phase model.…”

Section: Introductionmentioning

confidence: 99%

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Exciton optical absorption in asymmetric ZnO/ZnMgO double quantum wells with mixed phases*

et al. 2020

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The optical absorption of exciton interstate transition in Zn1 − xl Mg xl O/ZnO/Zn1 − xc Mg xc O/ZnO/Zn1 − xr Mg xr O asymmetric double quantum wells (ADQWs) with mixed phases of zinc-blende and wurtzite in Zn1 − x Mg x O for 0.37 < x < 0.62 is discussed. The mixed phases are taken into account by our weight model of fitting. The states of excitons are obtained by a finite difference method and a variational procedure in consideration of built-in electric fields (BEFs) and the Hartree potential. The optical absorption coefficients (OACs) of exciton interstate transition are obtained by the density matrix method. The results show that Hartree potential bends the conduction and valence bands, whereas a BEF tilts the bands and the combined effect enforces electrons and holes to approach the opposite interfaces to decrease the Coulomb interaction effects between electrons and holes. Furthermore, the OACs indicate a transformation between direct and indirect excitons in zinc-blende ADQWs due to the quantum confinement effects. There are two kinds of peaks corresponding to wurtzite and zinc-blende structures respectively, and the OACs merge together under some special conditions. The computed result of exciton interband emission energy agrees well with a previous experiment. Our conclusions are helpful for further relative theoretical studies, experiments, and design of devices consisting of these quantum well structures.

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Section: Theory and Modelmentioning

confidence: 99%

“…N D is the doping concentration at temperature T . [18] E f ,i is the Fermi energy and E D the donor energy level. And k B is the Boltzmann constant.…”

Section: Theory and Modelmentioning

confidence: 99%

“…For a wurtzite structure, the total polarization P tot k was described in detail in Ref. [18] For a zinc-blende structure, P tot k is just induced by the P pp k…”

Section: Theory and Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Exciton optical absorption in asymmetric ZnO/ZnMgO double quantum wells with mixed phases*

et al. 2020

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“…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. [16,17] Some results showed that the energy interval decreases whereas the dipole matrix element increases with increasing the barrier width in symmetric double semiparabolic QWs. [18] On the other hand, linear and nonlinear optical absorptions were discussed for different DQWs (e.g., semi-parabolic, parabolic, inverse parabolic, grade, square ones).…”

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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Enhancement of the optical absorption in MgZnO/ZnO quantum well under external electric field
Dakhlaoui
¹
,
Nefzi
²

2018
Optik
25
0
3
0
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Interband optical absorption in wurtzite MgxZn1−xO/ZnO/MgyZn1−yO asymmetric quantum wells

Cited by 8 publications

References 24 publications

Exciton optical absorption in asymmetric ZnO/ZnMgO double quantum wells with mixed phases*

Exciton optical absorption in asymmetric ZnO/ZnMgO double quantum wells with mixed phases*

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

Enhancement of the optical absorption in MgZnO/ZnO quantum well under external electric field

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Interband optical absorption in wurtzite MgxZn1−xO/ZnO/MgyZn1−yO asymmetric quantum wells

Cited by 8 publications

References 24 publications

Exciton optical absorption in asymmetric ZnO/ZnMgO double quantum wells with mixed phases*

Exciton optical absorption in asymmetric ZnO/ZnMgO double quantum wells with mixed phases*

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

Enhancement of the optical absorption in MgZnO/ZnO quantum well under external electric field

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Product

Resources

About

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