$Moiré-Trapped Interlayer Trions in a Charge-Tunable WSe_{2}/MoSe_{2} Heterobilayer$
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Moiré-Trapped Interlayer Trions in a Charge-Tunable WSe_{2}/MoSe_{2} Heterobilayer

Transition-metal dichalcogenide heterobilayers offer attractive opportunities to realize lattices of interacting bosons with several degrees of freedom. Such heterobilayers can feature moiré patterns that modulate their electronic band structure, leading to spatial confinement of single interlayer e...

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Autores principales:	Mauro Brotons-Gisbert, Hyeonjun Baek, Aidan Campbell, Kenji Watanabe, Takashi Taniguchi, Brian D. Gerardot
Formato:	article
Lenguaje:	EN
Publicado:	American Physical Society 2021
Materias:	Physics QC1-999
Acceso en línea:	https://doaj.org/article/bb2f891d72284ba1895be4294e5c7a57
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spelling	oai:doaj.org-article:bb2f891d72284ba1895be4294e5c7a572021-12-02T18:48:45ZMoiré-Trapped Interlayer Trions in a Charge-Tunable WSe_{2}/MoSe_{2} Heterobilayer10.1103/PhysRevX.11.0310332160-3308https://doaj.org/article/bb2f891d72284ba1895be4294e5c7a572021-08-01T00:00:00Zhttp://doi.org/10.1103/PhysRevX.11.031033http://doi.org/10.1103/PhysRevX.11.031033https://doaj.org/toc/2160-3308Transition-metal dichalcogenide heterobilayers offer attractive opportunities to realize lattices of interacting bosons with several degrees of freedom. Such heterobilayers can feature moiré patterns that modulate their electronic band structure, leading to spatial confinement of single interlayer excitons (IXs) that act as quantum emitters with C_{3} symmetry. However, the narrow emission linewidths of the quantum emitters contrast with a broad ensemble IX emission observed in nominally identical heterobilayers, opening a debate regarding the origin of IX emission. Here we report the continuous evolution from a few trapped IXs to an ensemble of IXs with both triplet- and singlet-spin configurations in a gate-tunable 2H-MoSe_{2}/WSe_{2} heterobilayer. We observe signatures of dipolar interactions in the IX ensemble regime which, when combined with magneto-optical spectroscopy, reveal that the narrow quantum-dot-like and broad ensemble emission originate from IXs trapped in moiré potentials with the same atomic registry. Finally, electron doping leads to the formation of three different species of localized negative trions with contrasting spin-valley configurations, among which we observe both intervalley and intravalley IX trions with spin-triplet optical transitions. Our results identify the origin of IX emission in MoSe_{2}/WSe_{2} heterobilayers and highlight the important role of exciton-exciton interactions and Fermi-level control in these highly tunable quantum materials.Mauro Brotons-GisbertHyeonjun BaekAidan CampbellKenji WatanabeTakashi TaniguchiBrian D. GerardotAmerican Physical SocietyarticlePhysicsQC1-999ENPhysical Review X, Vol 11, Iss 3, p 031033 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Physics QC1-999
spellingShingle	Physics QC1-999 Mauro Brotons-Gisbert Hyeonjun Baek Aidan Campbell Kenji Watanabe Takashi Taniguchi Brian D. Gerardot Moiré-Trapped Interlayer Trions in a Charge-Tunable WSe_{2}/MoSe_{2} Heterobilayer
description	Transition-metal dichalcogenide heterobilayers offer attractive opportunities to realize lattices of interacting bosons with several degrees of freedom. Such heterobilayers can feature moiré patterns that modulate their electronic band structure, leading to spatial confinement of single interlayer excitons (IXs) that act as quantum emitters with C_{3} symmetry. However, the narrow emission linewidths of the quantum emitters contrast with a broad ensemble IX emission observed in nominally identical heterobilayers, opening a debate regarding the origin of IX emission. Here we report the continuous evolution from a few trapped IXs to an ensemble of IXs with both triplet- and singlet-spin configurations in a gate-tunable 2H-MoSe_{2}/WSe_{2} heterobilayer. We observe signatures of dipolar interactions in the IX ensemble regime which, when combined with magneto-optical spectroscopy, reveal that the narrow quantum-dot-like and broad ensemble emission originate from IXs trapped in moiré potentials with the same atomic registry. Finally, electron doping leads to the formation of three different species of localized negative trions with contrasting spin-valley configurations, among which we observe both intervalley and intravalley IX trions with spin-triplet optical transitions. Our results identify the origin of IX emission in MoSe_{2}/WSe_{2} heterobilayers and highlight the important role of exciton-exciton interactions and Fermi-level control in these highly tunable quantum materials.
format	article
author	Mauro Brotons-Gisbert Hyeonjun Baek Aidan Campbell Kenji Watanabe Takashi Taniguchi Brian D. Gerardot
author_facet	Mauro Brotons-Gisbert Hyeonjun Baek Aidan Campbell Kenji Watanabe Takashi Taniguchi Brian D. Gerardot
author_sort	Mauro Brotons-Gisbert
title	Moiré-Trapped Interlayer Trions in a Charge-Tunable WSe_{2}/MoSe_{2} Heterobilayer
title_short	Moiré-Trapped Interlayer Trions in a Charge-Tunable WSe_{2}/MoSe_{2} Heterobilayer
title_full	Moiré-Trapped Interlayer Trions in a Charge-Tunable WSe_{2}/MoSe_{2} Heterobilayer
title_fullStr	Moiré-Trapped Interlayer Trions in a Charge-Tunable WSe_{2}/MoSe_{2} Heterobilayer
title_full_unstemmed	Moiré-Trapped Interlayer Trions in a Charge-Tunable WSe_{2}/MoSe_{2} Heterobilayer
title_sort	moiré-trapped interlayer trions in a charge-tunable wse_{2}/mose_{2} heterobilayer
publisher	American Physical Society
publishDate	2021
url	https://doaj.org/article/bb2f891d72284ba1895be4294e5c7a57
work_keys_str_mv	AT maurobrotonsgisbert moiretrappedinterlayertrionsinachargetunablewse2mose2heterobilayer AT hyeonjunbaek moiretrappedinterlayertrionsinachargetunablewse2mose2heterobilayer AT aidancampbell moiretrappedinterlayertrionsinachargetunablewse2mose2heterobilayer AT kenjiwatanabe moiretrappedinterlayertrionsinachargetunablewse2mose2heterobilayer AT takashitaniguchi moiretrappedinterlayertrionsinachargetunablewse2mose2heterobilayer AT briandgerardot moiretrappedinterlayertrionsinachargetunablewse2mose2heterobilayer
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Moiré-Trapped Interlayer Trions in a Charge-Tunable WSe_{2}/MoSe_{2} Heterobilayer

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