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Computation of intersubband transition energy and absorption spectra of binary capped GaAs/Al0.42Ga0.58As core-shell quantum dot

Computation of intersubband transition energy and absorption spectra of binary capped... AbstractIntersubband transition energy is computed for both core-shell quantum dot (CSQD) and binary capped core-shell quantum dot (CCSQD) of cubic geometry by solving the time-independent Schrodinger equation using the finite difference method. The discretization of the structures in all three spatial directions generates sparse Hamiltonian matrices, which are diagonalized to obtain energy eigenstates for the conduction band. The transition energy for the lowest three energy eigenstates is compared for different structural parameters considering GaAs  /  Al0.42Ga0.58As CSQDs. CSQD capped with AlAs (CCSQD) viz GaAs  /  Al0.42Ga0.58As  /  AlAs shows higher eigenstates and transition energy, which decreases with the increase in core thickness. Furthermore, the optical properties of these structures have been investigated which are in concurrence with the obtained eigen energy. The broader tuning range and blueshifted higher absorption coefficient of CCSQD support significant application in quantum dot detectors and lasers. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of Nanophotonics SPIE

Computation of intersubband transition energy and absorption spectra of binary capped GaAs/Al0.42Ga0.58As core-shell quantum dot

Journal of Nanophotonics , Volume 14 (2) – Apr 1, 2020

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References (50)

Publisher
SPIE
Copyright
© 2020 Society of Photo-Optical Instrumentation Engineers (SPIE)
ISSN
1934-2608
eISSN
1934-2608
DOI
10.1117/1.JNP.14.026003
Publisher site
See Article on Publisher Site

Abstract

AbstractIntersubband transition energy is computed for both core-shell quantum dot (CSQD) and binary capped core-shell quantum dot (CCSQD) of cubic geometry by solving the time-independent Schrodinger equation using the finite difference method. The discretization of the structures in all three spatial directions generates sparse Hamiltonian matrices, which are diagonalized to obtain energy eigenstates for the conduction band. The transition energy for the lowest three energy eigenstates is compared for different structural parameters considering GaAs  /  Al0.42Ga0.58As CSQDs. CSQD capped with AlAs (CCSQD) viz GaAs  /  Al0.42Ga0.58As  /  AlAs shows higher eigenstates and transition energy, which decreases with the increase in core thickness. Furthermore, the optical properties of these structures have been investigated which are in concurrence with the obtained eigen energy. The broader tuning range and blueshifted higher absorption coefficient of CCSQD support significant application in quantum dot detectors and lasers.

Journal

Journal of NanophotonicsSPIE

Published: Apr 1, 2020

Keywords: core-shell quantum dot; finite difference method; transition energy; absorption coefficient

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