Temperature dependent moiré trapping of interlayer excitons in MoSe2-WSe2 heterostructures

Abstract MoSe2–WSe2 heterostructures host strongly bound interlayer excitons (IXs), which exhibit bright photoluminescence (PL) when the twist angle is near 0° or 60°. Over the past several years, there have been numerous reports on the optical response of these heterostructures but no unifying mode...

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Autores principales:	Fateme Mahdikhanysarvejahany, Daniel N. Shanks, Christine Muccianti, Bekele H. Badada, Ithwun Idi, Adam Alfrey, Sean Raglow, Michael R. Koehler, David G. Mandrus, Takashi Taniguchi, Kenji Watanabe, Oliver L. A. Monti, Hongyi Yu, Brian J. LeRoy, John R. Schaibley
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Materials of engineering and construction. Mechanics of materials TA401-492 Chemistry QD1-999
Acceso en línea:	https://doaj.org/article/d18a7a4878c34948b6b5a668f8c3e0fb
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spelling	oai:doaj.org-article:d18a7a4878c34948b6b5a668f8c3e0fb2021-12-02T16:18:03ZTemperature dependent moiré trapping of interlayer excitons in MoSe2-WSe2 heterostructures10.1038/s41699-021-00248-72397-7132https://doaj.org/article/d18a7a4878c34948b6b5a668f8c3e0fb2021-07-01T00:00:00Zhttps://doi.org/10.1038/s41699-021-00248-7https://doaj.org/toc/2397-7132Abstract MoSe2–WSe2 heterostructures host strongly bound interlayer excitons (IXs), which exhibit bright photoluminescence (PL) when the twist angle is near 0° or 60°. Over the past several years, there have been numerous reports on the optical response of these heterostructures but no unifying model to understand the dynamics of IXs and their temperature dependence. Here we perform a comprehensive study of the temperature, excitation power, and time-dependent PL of IXs. We observe a significant decrease in PL intensity above a transition temperature that we attribute to a transition from localized to delocalized IXs. Astoundingly, we find a simple inverse relationship between the IX PL energy and the transition temperature, which exhibits opposite power-dependent behaviors for near 0° and 60° samples. We conclude that this temperature dependence is a result of IX–IX exchange interactions, whose effect is suppressed by the moiré potential trapping IXs at low temperature.Fateme MahdikhanysarvejahanyDaniel N. ShanksChristine MucciantiBekele H. BadadaIthwun IdiAdam AlfreySean RaglowMichael R. KoehlerDavid G. MandrusTakashi TaniguchiKenji WatanabeOliver L. A. MontiHongyi YuBrian J. LeRoyJohn R. SchaibleyNature PortfolioarticleMaterials of engineering and construction. Mechanics of materialsTA401-492ChemistryQD1-999ENnpj 2D Materials and Applications, Vol 5, Iss 1, Pp 1-6 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Materials of engineering and construction. Mechanics of materials TA401-492 Chemistry QD1-999
spellingShingle	Materials of engineering and construction. Mechanics of materials TA401-492 Chemistry QD1-999 Fateme Mahdikhanysarvejahany Daniel N. Shanks Christine Muccianti Bekele H. Badada Ithwun Idi Adam Alfrey Sean Raglow Michael R. Koehler David G. Mandrus Takashi Taniguchi Kenji Watanabe Oliver L. A. Monti Hongyi Yu Brian J. LeRoy John R. Schaibley Temperature dependent moiré trapping of interlayer excitons in MoSe2-WSe2 heterostructures
description	Abstract MoSe2–WSe2 heterostructures host strongly bound interlayer excitons (IXs), which exhibit bright photoluminescence (PL) when the twist angle is near 0° or 60°. Over the past several years, there have been numerous reports on the optical response of these heterostructures but no unifying model to understand the dynamics of IXs and their temperature dependence. Here we perform a comprehensive study of the temperature, excitation power, and time-dependent PL of IXs. We observe a significant decrease in PL intensity above a transition temperature that we attribute to a transition from localized to delocalized IXs. Astoundingly, we find a simple inverse relationship between the IX PL energy and the transition temperature, which exhibits opposite power-dependent behaviors for near 0° and 60° samples. We conclude that this temperature dependence is a result of IX–IX exchange interactions, whose effect is suppressed by the moiré potential trapping IXs at low temperature.
format	article
author	Fateme Mahdikhanysarvejahany Daniel N. Shanks Christine Muccianti Bekele H. Badada Ithwun Idi Adam Alfrey Sean Raglow Michael R. Koehler David G. Mandrus Takashi Taniguchi Kenji Watanabe Oliver L. A. Monti Hongyi Yu Brian J. LeRoy John R. Schaibley
author_facet	Fateme Mahdikhanysarvejahany Daniel N. Shanks Christine Muccianti Bekele H. Badada Ithwun Idi Adam Alfrey Sean Raglow Michael R. Koehler David G. Mandrus Takashi Taniguchi Kenji Watanabe Oliver L. A. Monti Hongyi Yu Brian J. LeRoy John R. Schaibley
author_sort	Fateme Mahdikhanysarvejahany
title	Temperature dependent moiré trapping of interlayer excitons in MoSe2-WSe2 heterostructures
title_short	Temperature dependent moiré trapping of interlayer excitons in MoSe2-WSe2 heterostructures
title_full	Temperature dependent moiré trapping of interlayer excitons in MoSe2-WSe2 heterostructures
title_fullStr	Temperature dependent moiré trapping of interlayer excitons in MoSe2-WSe2 heterostructures
title_full_unstemmed	Temperature dependent moiré trapping of interlayer excitons in MoSe2-WSe2 heterostructures
title_sort	temperature dependent moiré trapping of interlayer excitons in mose2-wse2 heterostructures
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/d18a7a4878c34948b6b5a668f8c3e0fb
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Temperature dependent moiré trapping of interlayer excitons in MoSe2-WSe2 heterostructures

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