Spin relaxation dynamics of holes in intrinsic GaAs quantum wells studied by transient circular dichromatic absorption spectroscopy at room temperature

Abstract Spin relaxation dynamics of holes in intrinsic GaAs quantum wells is studied using time-resolved circular dichromatic absorption spectroscopy at room temperature. It is found that ultrafast dynamics is dominated by the cooperative contributions of band filling and many-body effects. The rel...

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Autores principales:	Shaoyin Fang, Ruidan Zhu, Tianshu Lai
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2017
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/c4e39e43fc544963b4848b9940cb02cf
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spelling	oai:doaj.org-article:c4e39e43fc544963b4848b9940cb02cf2021-12-02T12:31:47ZSpin relaxation dynamics of holes in intrinsic GaAs quantum wells studied by transient circular dichromatic absorption spectroscopy at room temperature10.1038/s41598-017-00396-12045-2322https://doaj.org/article/c4e39e43fc544963b4848b9940cb02cf2017-03-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-00396-1https://doaj.org/toc/2045-2322Abstract Spin relaxation dynamics of holes in intrinsic GaAs quantum wells is studied using time-resolved circular dichromatic absorption spectroscopy at room temperature. It is found that ultrafast dynamics is dominated by the cooperative contributions of band filling and many-body effects. The relative contribution of the two effects is opposite in strength for electrons and holes. As a result, transient circular dichromatic differential transmission (TCD-DT) with co- and cross-circularly polarized pump and probe presents different strength at several picosecond delay time. Ultrafast spin relaxation dynamics of excited holes is sensitively reflected in TCD-DT with cross-circularly polarized pump and probe. A model, including coherent artifact, thermalization of nonthermal carriers and the cooperative contribution of band filling and many-body effects, is developed, and used to fit TCD-DT with cross-circularly polarized pump and probe. Spin relaxation time of holes is achieved as a function of excited hole density for the first time at room temperature, and increases with hole density, which disagrees with a theoretical prediction based on EY spin relaxation mechanism, implying that EY mechanism may be not dominant hole spin relaxation mechanism at room temperature, but DP mechanism is dominant possibly.Shaoyin FangRuidan ZhuTianshu LaiNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 7, Iss 1, Pp 1-7 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Shaoyin Fang Ruidan Zhu Tianshu Lai Spin relaxation dynamics of holes in intrinsic GaAs quantum wells studied by transient circular dichromatic absorption spectroscopy at room temperature
description	Abstract Spin relaxation dynamics of holes in intrinsic GaAs quantum wells is studied using time-resolved circular dichromatic absorption spectroscopy at room temperature. It is found that ultrafast dynamics is dominated by the cooperative contributions of band filling and many-body effects. The relative contribution of the two effects is opposite in strength for electrons and holes. As a result, transient circular dichromatic differential transmission (TCD-DT) with co- and cross-circularly polarized pump and probe presents different strength at several picosecond delay time. Ultrafast spin relaxation dynamics of excited holes is sensitively reflected in TCD-DT with cross-circularly polarized pump and probe. A model, including coherent artifact, thermalization of nonthermal carriers and the cooperative contribution of band filling and many-body effects, is developed, and used to fit TCD-DT with cross-circularly polarized pump and probe. Spin relaxation time of holes is achieved as a function of excited hole density for the first time at room temperature, and increases with hole density, which disagrees with a theoretical prediction based on EY spin relaxation mechanism, implying that EY mechanism may be not dominant hole spin relaxation mechanism at room temperature, but DP mechanism is dominant possibly.
format	article
author	Shaoyin Fang Ruidan Zhu Tianshu Lai
author_facet	Shaoyin Fang Ruidan Zhu Tianshu Lai
author_sort	Shaoyin Fang
title	Spin relaxation dynamics of holes in intrinsic GaAs quantum wells studied by transient circular dichromatic absorption spectroscopy at room temperature
title_short	Spin relaxation dynamics of holes in intrinsic GaAs quantum wells studied by transient circular dichromatic absorption spectroscopy at room temperature
title_full	Spin relaxation dynamics of holes in intrinsic GaAs quantum wells studied by transient circular dichromatic absorption spectroscopy at room temperature
title_fullStr	Spin relaxation dynamics of holes in intrinsic GaAs quantum wells studied by transient circular dichromatic absorption spectroscopy at room temperature
title_full_unstemmed	Spin relaxation dynamics of holes in intrinsic GaAs quantum wells studied by transient circular dichromatic absorption spectroscopy at room temperature
title_sort	spin relaxation dynamics of holes in intrinsic gaas quantum wells studied by transient circular dichromatic absorption spectroscopy at room temperature
publisher	Nature Portfolio
publishDate	2017
url	https://doaj.org/article/c4e39e43fc544963b4848b9940cb02cf
work_keys_str_mv	AT shaoyinfang spinrelaxationdynamicsofholesinintrinsicgaasquantumwellsstudiedbytransientcirculardichromaticabsorptionspectroscopyatroomtemperature AT ruidanzhu spinrelaxationdynamicsofholesinintrinsicgaasquantumwellsstudiedbytransientcirculardichromaticabsorptionspectroscopyatroomtemperature AT tianshulai spinrelaxationdynamicsofholesinintrinsicgaasquantumwellsstudiedbytransientcirculardichromaticabsorptionspectroscopyatroomtemperature
_version_	1718394304392593408

Spin relaxation dynamics of holes in intrinsic GaAs quantum wells studied by transient circular dichromatic absorption spectroscopy at room temperature

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