Long tailed trions in monolayer MoS2: Temperature dependent asymmetry and resulting red-shift of trion photoluminescence spectra

Abstract Monolayer molybdenum disulfide (MoS2) has emerged as a model system for studying many-body physics because the low dimensionality reduces screening leading to tightly bound states stable at room temperature. Further, the many-body states possess a pseudo-spin degree of freedom that correspo...

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Autores principales:	Jason W. Christopher, Bennett B. Goldberg, Anna K. Swan
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2017
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/635625e8f1a54fb9893e60f2910e6b2a
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spelling	oai:doaj.org-article:635625e8f1a54fb9893e60f2910e6b2a2021-12-02T15:06:09ZLong tailed trions in monolayer MoS2: Temperature dependent asymmetry and resulting red-shift of trion photoluminescence spectra10.1038/s41598-017-14378-w2045-2322https://doaj.org/article/635625e8f1a54fb9893e60f2910e6b2a2017-10-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-14378-whttps://doaj.org/toc/2045-2322Abstract Monolayer molybdenum disulfide (MoS2) has emerged as a model system for studying many-body physics because the low dimensionality reduces screening leading to tightly bound states stable at room temperature. Further, the many-body states possess a pseudo-spin degree of freedom that corresponds with the two direct-gap valleys of the band structure, which can be optically manipulated. Here we focus on one bound state, the negatively charged trion. Unlike excitons, trions can radiatively decay with non-zero momentum by kicking out an electron, resulting in an asymmetric trion photoluminescence (PL) peak with a long low-energy tail and peak position that differs from the zero momentum trion energy. The asymmetry of the trion PL peak and resulting peak red-shift depends both on the trion size and a temperature-dependent contribution. Ignoring the trion asymmetry will result in over estimating the trion binding energy by nearly 20 meV at room temperature. We analyze the temperature-dependent PL to reveal the effective trion size, consistent with the literature, and the temperature dependence of the band gap and spin-orbit splitting of the valence band. This is the first time the temperature-dependence of the trion PL has been analyzed with such detail in any system.Jason W. ChristopherBennett B. GoldbergAnna K. SwanNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 7, Iss 1, Pp 1-8 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Jason W. Christopher Bennett B. Goldberg Anna K. Swan Long tailed trions in monolayer MoS2: Temperature dependent asymmetry and resulting red-shift of trion photoluminescence spectra
description	Abstract Monolayer molybdenum disulfide (MoS2) has emerged as a model system for studying many-body physics because the low dimensionality reduces screening leading to tightly bound states stable at room temperature. Further, the many-body states possess a pseudo-spin degree of freedom that corresponds with the two direct-gap valleys of the band structure, which can be optically manipulated. Here we focus on one bound state, the negatively charged trion. Unlike excitons, trions can radiatively decay with non-zero momentum by kicking out an electron, resulting in an asymmetric trion photoluminescence (PL) peak with a long low-energy tail and peak position that differs from the zero momentum trion energy. The asymmetry of the trion PL peak and resulting peak red-shift depends both on the trion size and a temperature-dependent contribution. Ignoring the trion asymmetry will result in over estimating the trion binding energy by nearly 20 meV at room temperature. We analyze the temperature-dependent PL to reveal the effective trion size, consistent with the literature, and the temperature dependence of the band gap and spin-orbit splitting of the valence band. This is the first time the temperature-dependence of the trion PL has been analyzed with such detail in any system.
format	article
author	Jason W. Christopher Bennett B. Goldberg Anna K. Swan
author_facet	Jason W. Christopher Bennett B. Goldberg Anna K. Swan
author_sort	Jason W. Christopher
title	Long tailed trions in monolayer MoS2: Temperature dependent asymmetry and resulting red-shift of trion photoluminescence spectra
title_short	Long tailed trions in monolayer MoS2: Temperature dependent asymmetry and resulting red-shift of trion photoluminescence spectra
title_full	Long tailed trions in monolayer MoS2: Temperature dependent asymmetry and resulting red-shift of trion photoluminescence spectra
title_fullStr	Long tailed trions in monolayer MoS2: Temperature dependent asymmetry and resulting red-shift of trion photoluminescence spectra
title_full_unstemmed	Long tailed trions in monolayer MoS2: Temperature dependent asymmetry and resulting red-shift of trion photoluminescence spectra
title_sort	long tailed trions in monolayer mos2: temperature dependent asymmetry and resulting red-shift of trion photoluminescence spectra
publisher	Nature Portfolio
publishDate	2017
url	https://doaj.org/article/635625e8f1a54fb9893e60f2910e6b2a
work_keys_str_mv	AT jasonwchristopher longtailedtrionsinmonolayermos2temperaturedependentasymmetryandresultingredshiftoftrionphotoluminescencespectra AT bennettbgoldberg longtailedtrionsinmonolayermos2temperaturedependentasymmetryandresultingredshiftoftrionphotoluminescencespectra AT annakswan longtailedtrionsinmonolayermos2temperaturedependentasymmetryandresultingredshiftoftrionphotoluminescencespectra
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Long tailed trions in monolayer MoS2: Temperature dependent asymmetry and resulting red-shift of trion photoluminescence spectra

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