Phonon-assisted relaxation between triplet and singlet states in a self-assembled double quantum dot

Abstract We study theoretically phonon-induced spin dynamics of two electrons confined in a self-assembled double quantum dot. We calculate the transition rates and time evolution of occupations for the spin-triplet and spin-singlet states. We characterize the relative importance of various relaxati...

Descripción completa

Guardado en:

Detalles Bibliográficos
Autores principales:	Krzysztof Gawarecki, Paweł Machnikowski
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/08744c7d11d34049835753f252e8c860
Etiquetas:	Agregar Etiqueta Sin Etiquetas, Sea el primero en etiquetar este registro!

id	oai:doaj.org-article:08744c7d11d34049835753f252e8c860
record_format	dspace
spelling	oai:doaj.org-article:08744c7d11d34049835753f252e8c8602021-12-02T16:13:47ZPhonon-assisted relaxation between triplet and singlet states in a self-assembled double quantum dot10.1038/s41598-021-94621-72045-2322https://doaj.org/article/08744c7d11d34049835753f252e8c8602021-07-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-94621-7https://doaj.org/toc/2045-2322Abstract We study theoretically phonon-induced spin dynamics of two electrons confined in a self-assembled double quantum dot. We calculate the transition rates and time evolution of occupations for the spin-triplet and spin-singlet states. We characterize the relative importance of various relaxation channels, including two-phonon processes, as a function of the electric and magnetic fields. The simulations are based on a model combining the eight-band $$\varvec{k}\!\cdot \!\varvec{p}$$ k · p method and configuration-interaction approach. We show that the electron g-factor mismatch between the Zeeman doublets localized on different dots opens a relatively fast triplet-singlet phonon-assisted relaxation channel. We also demonstrate, that the relaxation near the triplet-singlet anticrossing is slowed down up to several orders of magnitude due to vanishing of some relaxation channels.Krzysztof GawareckiPaweł MachnikowskiNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-12 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Krzysztof Gawarecki Paweł Machnikowski Phonon-assisted relaxation between triplet and singlet states in a self-assembled double quantum dot
description	Abstract We study theoretically phonon-induced spin dynamics of two electrons confined in a self-assembled double quantum dot. We calculate the transition rates and time evolution of occupations for the spin-triplet and spin-singlet states. We characterize the relative importance of various relaxation channels, including two-phonon processes, as a function of the electric and magnetic fields. The simulations are based on a model combining the eight-band $$\varvec{k}\!\cdot \!\varvec{p}$$ k · p method and configuration-interaction approach. We show that the electron g-factor mismatch between the Zeeman doublets localized on different dots opens a relatively fast triplet-singlet phonon-assisted relaxation channel. We also demonstrate, that the relaxation near the triplet-singlet anticrossing is slowed down up to several orders of magnitude due to vanishing of some relaxation channels.
format	article
author	Krzysztof Gawarecki Paweł Machnikowski
author_facet	Krzysztof Gawarecki Paweł Machnikowski
author_sort	Krzysztof Gawarecki
title	Phonon-assisted relaxation between triplet and singlet states in a self-assembled double quantum dot
title_short	Phonon-assisted relaxation between triplet and singlet states in a self-assembled double quantum dot
title_full	Phonon-assisted relaxation between triplet and singlet states in a self-assembled double quantum dot
title_fullStr	Phonon-assisted relaxation between triplet and singlet states in a self-assembled double quantum dot
title_full_unstemmed	Phonon-assisted relaxation between triplet and singlet states in a self-assembled double quantum dot
title_sort	phonon-assisted relaxation between triplet and singlet states in a self-assembled double quantum dot
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/08744c7d11d34049835753f252e8c860
work_keys_str_mv	AT krzysztofgawarecki phononassistedrelaxationbetweentripletandsingletstatesinaselfassembleddoublequantumdot AT pawełmachnikowski phononassistedrelaxationbetweentripletandsingletstatesinaselfassembleddoublequantumdot
_version_	1718384332706414592

Phonon-assisted relaxation between triplet and singlet states in a self-assembled double quantum dot

Ejemplares similares