Theory of excitons in gated bilayer graphene quantum dots

Par Conseil national de recherches du Canada

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DOI	Trouver le DOI : https://doi.org/10.1021/acs.nanolett.3c00406
Auteur	Rechercher : Saleem, Yasser Identifiant ORCID : https://orcid.org/0000-0002-9061-6110; Rechercher : Sadecka, Katarzyna; Rechercher : Korkusinski, Marek¹; Rechercher : Miravet, Daniel; Rechercher : Dusko, Amintor; Rechercher : Hawrylak, Pawel
Affiliation	Conseil national de recherches du Canada. Technologies de sécurité et de rupture
Bailleur de fonds	Rechercher : Narodowa Agencja Wymiany Akademickiej; Rechercher : Natural Sciences and Engineering Research Council of Canada
Format	Texte, Article
Sujet	excitons; quantumdots; graphene; two-dimensionalmaterials; terahertz
Résumé	We present a theory of excitons in gated bilayer graphene (BLG) quantum dots (QDs). Electrical gating of BLG opens an energy gap, turning this material into an electrically tunable semiconductor. Unlike in laterally gated semiconductor QDs, where electrons are attracted and holes repelled, we show here that lateral structuring of metallic gates results in a gated lateral QD confining both electrons and holes. Using an accurate atomistic approach and exact diagonalization tools, we describe strongly interacting electrons and holes forming an electrically tunable exciton. We find these excitons to be different from those found in semiconductor QDs and nanocrystals, with exciton energy tunable by voltage from the terahertz to far infrared (FIR) range. The conservation of spin, valley, and orbital angular momentum results in an exciton fine structure with a band of dark low-energy states, making this system a promising candidate for storage, detection and emission of photons in the terahertz range.
Date de publication	2023-03-24
Maison d’édition	American Chemical Society
Licence	Creative Commons, Attribution - Pas d’Utilisation Commerciale – Pas de Modification 4.0 International (CC BY-NC-ND 4.0) https://creativecommons.org/licenses/by-nc-nd/4.0/deed.fr
Dans	Nano Letters 23, nº 7 (24 mars 2023) : 2998–3004.
Langue	anglais
Publications évaluées par des pairs	Oui
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Identificateur de l’enregistrement	608291a3-3209-4f7f-8914-97c5dff5e3d8
Enregistrement créé	2023-12-08
Enregistrement modifié	2023-12-11

Date de modification :: 2024-07-19