Self-consistent gain calculations and carrier transport analysis for split-well direct-phonon terahertz quantum cascade lasers

Self-consistent gain calculations and carrier transport analysis for split-well direct-phonon terahertz quantum cascade lasers

A split-well direct phonon THz quantum cascade laser scheme supporting a clean three-level system was analyzed using nonequilibrium Green’s functions. In this system, most of the electrons occupy the lower three levels, and thermally activated leakage channels are suppressed almost entirely. The sim...

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Main Authors: Nathalie Lander Gower, Silvia Piperno, Asaf Albo
Format: Article
Language:English
Published: AIP Publishing LLC 2020-11-01
Series:AIP Advances
Online Access:http://dx.doi.org/10.1063/5.0015952
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spelling doaj-c82f7c0970924856b7e7ac5ef54bcd282020-12-04T12:45:21ZengAIP Publishing LLCAIP Advances2158-32262020-11-011011115319115319-610.1063/5.0015952Self-consistent gain calculations and carrier transport analysis for split-well direct-phonon terahertz quantum cascade lasersNathalie Lander Gower0Silvia Piperno1Asaf Albo2Faculty of Engineering, Bar-Ilan University, Ramat Gan 5290002, IsraelFaculty of Engineering, Bar-Ilan University, Ramat Gan 5290002, IsraelFaculty of Engineering, Bar-Ilan University, Ramat Gan 5290002, IsraelA split-well direct phonon THz quantum cascade laser scheme supporting a clean three-level system was analyzed using nonequilibrium Green’s functions. In this system, most of the electrons occupy the lower three levels, and thermally activated leakage channels are suppressed almost entirely. The simulations showed that the gain values were deeply affected by the changes in the devices’ interface roughness and impurity scattering strengths. We concluded that in addition to the low oscillator strength and relatively low doping level, these are the mechanisms responsible for the temperature performance limitations of this scheme.http://dx.doi.org/10.1063/5.0015952
collection DOAJ
language English
format Article
sources DOAJ
author Nathalie Lander Gower
Silvia Piperno
Asaf Albo
spellingShingle Nathalie Lander Gower
Silvia Piperno
Asaf Albo
Self-consistent gain calculations and carrier transport analysis for split-well direct-phonon terahertz quantum cascade lasers
AIP Advances
author_facet Nathalie Lander Gower
Silvia Piperno
Asaf Albo
author_sort Nathalie Lander Gower
title Self-consistent gain calculations and carrier transport analysis for split-well direct-phonon terahertz quantum cascade lasers
title_short Self-consistent gain calculations and carrier transport analysis for split-well direct-phonon terahertz quantum cascade lasers
title_full Self-consistent gain calculations and carrier transport analysis for split-well direct-phonon terahertz quantum cascade lasers
title_fullStr Self-consistent gain calculations and carrier transport analysis for split-well direct-phonon terahertz quantum cascade lasers
title_full_unstemmed Self-consistent gain calculations and carrier transport analysis for split-well direct-phonon terahertz quantum cascade lasers
title_sort self-consistent gain calculations and carrier transport analysis for split-well direct-phonon terahertz quantum cascade lasers
publisher AIP Publishing LLC
series AIP Advances
issn 2158-3226
publishDate 2020-11-01
description A split-well direct phonon THz quantum cascade laser scheme supporting a clean three-level system was analyzed using nonequilibrium Green’s functions. In this system, most of the electrons occupy the lower three levels, and thermally activated leakage channels are suppressed almost entirely. The simulations showed that the gain values were deeply affected by the changes in the devices’ interface roughness and impurity scattering strengths. We concluded that in addition to the low oscillator strength and relatively low doping level, these are the mechanisms responsible for the temperature performance limitations of this scheme.
url http://dx.doi.org/10.1063/5.0015952
work_keys_str_mv AT nathalielandergower selfconsistentgaincalculationsandcarriertransportanalysisforsplitwelldirectphononterahertzquantumcascadelasers
AT silviapiperno selfconsistentgaincalculationsandcarriertransportanalysisforsplitwelldirectphononterahertzquantumcascadelasers
AT asafalbo selfconsistentgaincalculationsandcarriertransportanalysisforsplitwelldirectphononterahertzquantumcascadelasers
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