Effect of the hydrostatic pressure and shell's Al composition in the intraband absorption coefficient for core/shell spherical GaAs/AlxGa1−xAs quantum dots

K. A. Rodríguez-Magdaleno, M. E. Mora-Ramos, R. Pérez-Álvarez, J. C. Martínez-Orozco

Resultado de la investigación: Contribución a una revistaArtículo

Resumen

In this paper we theoretically investigate the role of hydrostatic pressure by analyzing its influence on potential barrier's height in GaAs/AlxGa1−xAs core/shell spherical quantum dots. The values of hydrostatic pressure considered here are always below the Γ−X crossover. In addition, we take into account the barrier shell's size effects and the barrier's aluminum concentration, looking for a description of the features of the intraband optical absorption coefficient in the system. The electronic structure is calculated within the effective mass approximation. From the numerical point of view the hybrid matrix method was implemented to avoid numerical instability issues that appears in the conventional transfer matrix method. The main intersubband optical transition is considered to take place between the 1s and 1p computed electronic states. The results show that the absorption coefficient undergoes first a red-shift and later a more pronounced blue-shift, depending on the AlxGa1−xAs barrier width (wb1). The absorption coefficient experiences a blue-shift as the barrier's aluminum concentration increases, and it is non monotonically red-shifted as the hydrostatic pressure augments, due to the barrier's height pressure dependency. For the chosen system parameters, the absorption coefficient resonant peak lies within the range of 20 to 30 meV, that corresponds to the THz frequency region. Accordingly, this system can be proposed as a building block for photodetectors in the THz electromagnetic spectrum region.

Idioma originalInglés
Número de artículo104906
PublicaciónMaterials Science in Semiconductor Processing
Volumen108
DOI
EstadoPublicada - 15 mar 2020
Publicado de forma externa

Huella dactilar

spherical shells
Hydrostatic pressure
hydrostatic pressure
Semiconductor quantum dots
absorptivity
quantum dots
Aluminum
Chemical analysis
Transfer matrix method
Optical transitions
Electronic states
Photodetectors
blue shift
matrix methods
Light absorption
Electronic structure
aluminum
electromagnetic spectra
optical transition
red shift

Citar esto

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title = "Effect of the hydrostatic pressure and shell's Al composition in the intraband absorption coefficient for core/shell spherical GaAs/AlxGa1−xAs quantum dots",
abstract = "In this paper we theoretically investigate the role of hydrostatic pressure by analyzing its influence on potential barrier's height in GaAs/AlxGa1−xAs core/shell spherical quantum dots. The values of hydrostatic pressure considered here are always below the Γ−X crossover. In addition, we take into account the barrier shell's size effects and the barrier's aluminum concentration, looking for a description of the features of the intraband optical absorption coefficient in the system. The electronic structure is calculated within the effective mass approximation. From the numerical point of view the hybrid matrix method was implemented to avoid numerical instability issues that appears in the conventional transfer matrix method. The main intersubband optical transition is considered to take place between the 1s and 1p computed electronic states. The results show that the absorption coefficient undergoes first a red-shift and later a more pronounced blue-shift, depending on the AlxGa1−xAs barrier width (wb1). The absorption coefficient experiences a blue-shift as the barrier's aluminum concentration increases, and it is non monotonically red-shifted as the hydrostatic pressure augments, due to the barrier's height pressure dependency. For the chosen system parameters, the absorption coefficient resonant peak lies within the range of 20 to 30 meV, that corresponds to the THz frequency region. Accordingly, this system can be proposed as a building block for photodetectors in the THz electromagnetic spectrum region.",
keywords = "Absorption coefficient, Intraband transitions, Spherical quantum dot, Terahertz",
author = "Rodr{\'i}guez-Magdaleno, {K. A.} and Mora-Ramos, {M. E.} and R. P{\'e}rez-{\'A}lvarez and Mart{\'i}nez-Orozco, {J. C.}",
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Effect of the hydrostatic pressure and shell's Al composition in the intraband absorption coefficient for core/shell spherical GaAs/AlxGa1−xAs quantum dots. / Rodríguez-Magdaleno, K. A.; Mora-Ramos, M. E.; Pérez-Álvarez, R.; Martínez-Orozco, J. C.

En: Materials Science in Semiconductor Processing, Vol. 108, 104906, 15.03.2020.

Resultado de la investigación: Contribución a una revistaArtículo

TY - JOUR

T1 - Effect of the hydrostatic pressure and shell's Al composition in the intraband absorption coefficient for core/shell spherical GaAs/AlxGa1−xAs quantum dots

AU - Rodríguez-Magdaleno, K. A.

AU - Mora-Ramos, M. E.

AU - Pérez-Álvarez, R.

AU - Martínez-Orozco, J. C.

PY - 2020/3/15

Y1 - 2020/3/15

N2 - In this paper we theoretically investigate the role of hydrostatic pressure by analyzing its influence on potential barrier's height in GaAs/AlxGa1−xAs core/shell spherical quantum dots. The values of hydrostatic pressure considered here are always below the Γ−X crossover. In addition, we take into account the barrier shell's size effects and the barrier's aluminum concentration, looking for a description of the features of the intraband optical absorption coefficient in the system. The electronic structure is calculated within the effective mass approximation. From the numerical point of view the hybrid matrix method was implemented to avoid numerical instability issues that appears in the conventional transfer matrix method. The main intersubband optical transition is considered to take place between the 1s and 1p computed electronic states. The results show that the absorption coefficient undergoes first a red-shift and later a more pronounced blue-shift, depending on the AlxGa1−xAs barrier width (wb1). The absorption coefficient experiences a blue-shift as the barrier's aluminum concentration increases, and it is non monotonically red-shifted as the hydrostatic pressure augments, due to the barrier's height pressure dependency. For the chosen system parameters, the absorption coefficient resonant peak lies within the range of 20 to 30 meV, that corresponds to the THz frequency region. Accordingly, this system can be proposed as a building block for photodetectors in the THz electromagnetic spectrum region.

AB - In this paper we theoretically investigate the role of hydrostatic pressure by analyzing its influence on potential barrier's height in GaAs/AlxGa1−xAs core/shell spherical quantum dots. The values of hydrostatic pressure considered here are always below the Γ−X crossover. In addition, we take into account the barrier shell's size effects and the barrier's aluminum concentration, looking for a description of the features of the intraband optical absorption coefficient in the system. The electronic structure is calculated within the effective mass approximation. From the numerical point of view the hybrid matrix method was implemented to avoid numerical instability issues that appears in the conventional transfer matrix method. The main intersubband optical transition is considered to take place between the 1s and 1p computed electronic states. The results show that the absorption coefficient undergoes first a red-shift and later a more pronounced blue-shift, depending on the AlxGa1−xAs barrier width (wb1). The absorption coefficient experiences a blue-shift as the barrier's aluminum concentration increases, and it is non monotonically red-shifted as the hydrostatic pressure augments, due to the barrier's height pressure dependency. For the chosen system parameters, the absorption coefficient resonant peak lies within the range of 20 to 30 meV, that corresponds to the THz frequency region. Accordingly, this system can be proposed as a building block for photodetectors in the THz electromagnetic spectrum region.

KW - Absorption coefficient

KW - Intraband transitions

KW - Spherical quantum dot

KW - Terahertz

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