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Moiré potential impedes interlayer exciton diffusion in van der Waals heterostructures

The properties of van der Waals heterostructures are drastically altered by a tunable moiré superlattice arising from periodically varying atomic alignment between the layers. Exciton diffusion represents an important channel of energy transport in transition metal dichalcogenides (TMDs). While earl...

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Detalles Bibliográficos
Autores principales: Choi, Junho, Hsu, Wei-Ting, Lu, Li-Syuan, Sun, Liuyang, Cheng, Hui-Yu, Lee, Ming-Hao, Quan, Jiamin, Tran, Kha, Wang, Chun-Yuan, Staab, Matthew, Jones, Kayleigh, Taniguchi, Takashi, Watanabe, Kenji, Chu, Ming-Wen, Gwo, Shangjr, Kim, Suenne, Shih, Chih-Kang, Li, Xiaoqin, Chang, Wen-Hao
Formato: Online Artículo Texto
Lenguaje:English
Publicado: American Association for the Advancement of Science 2020
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7531884/
https://www.ncbi.nlm.nih.gov/pubmed/32967823
http://dx.doi.org/10.1126/sciadv.aba8866
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author Choi, Junho
Hsu, Wei-Ting
Lu, Li-Syuan
Sun, Liuyang
Cheng, Hui-Yu
Lee, Ming-Hao
Quan, Jiamin
Tran, Kha
Wang, Chun-Yuan
Staab, Matthew
Jones, Kayleigh
Taniguchi, Takashi
Watanabe, Kenji
Chu, Ming-Wen
Gwo, Shangjr
Kim, Suenne
Shih, Chih-Kang
Li, Xiaoqin
Chang, Wen-Hao
author_facet Choi, Junho
Hsu, Wei-Ting
Lu, Li-Syuan
Sun, Liuyang
Cheng, Hui-Yu
Lee, Ming-Hao
Quan, Jiamin
Tran, Kha
Wang, Chun-Yuan
Staab, Matthew
Jones, Kayleigh
Taniguchi, Takashi
Watanabe, Kenji
Chu, Ming-Wen
Gwo, Shangjr
Kim, Suenne
Shih, Chih-Kang
Li, Xiaoqin
Chang, Wen-Hao
author_sort Choi, Junho
collection PubMed
description The properties of van der Waals heterostructures are drastically altered by a tunable moiré superlattice arising from periodically varying atomic alignment between the layers. Exciton diffusion represents an important channel of energy transport in transition metal dichalcogenides (TMDs). While early studies performed on TMD heterobilayers suggested that carriers and excitons exhibit long diffusion, a rich variety of scenarios can exist. In a moiré crystal with a large supercell and deep potential, interlayer excitons may be completely localized. As the moiré period reduces at a larger twist angle, excitons can tunnel between supercells and diffuse over a longer lifetime. The diffusion should be the longest in commensurate heterostructures where the moiré superlattice is completely absent. Here, we experimentally demonstrate the rich phenomena of interlayer exciton diffusion in WSe(2)/MoSe(2) heterostructures by comparing several samples prepared with chemical vapor deposition and mechanical stacking with accurately controlled twist angles.
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spelling pubmed-75318842020-10-13 Moiré potential impedes interlayer exciton diffusion in van der Waals heterostructures Choi, Junho Hsu, Wei-Ting Lu, Li-Syuan Sun, Liuyang Cheng, Hui-Yu Lee, Ming-Hao Quan, Jiamin Tran, Kha Wang, Chun-Yuan Staab, Matthew Jones, Kayleigh Taniguchi, Takashi Watanabe, Kenji Chu, Ming-Wen Gwo, Shangjr Kim, Suenne Shih, Chih-Kang Li, Xiaoqin Chang, Wen-Hao Sci Adv Research Articles The properties of van der Waals heterostructures are drastically altered by a tunable moiré superlattice arising from periodically varying atomic alignment between the layers. Exciton diffusion represents an important channel of energy transport in transition metal dichalcogenides (TMDs). While early studies performed on TMD heterobilayers suggested that carriers and excitons exhibit long diffusion, a rich variety of scenarios can exist. In a moiré crystal with a large supercell and deep potential, interlayer excitons may be completely localized. As the moiré period reduces at a larger twist angle, excitons can tunnel between supercells and diffuse over a longer lifetime. The diffusion should be the longest in commensurate heterostructures where the moiré superlattice is completely absent. Here, we experimentally demonstrate the rich phenomena of interlayer exciton diffusion in WSe(2)/MoSe(2) heterostructures by comparing several samples prepared with chemical vapor deposition and mechanical stacking with accurately controlled twist angles. American Association for the Advancement of Science 2020-09-23 /pmc/articles/PMC7531884/ /pubmed/32967823 http://dx.doi.org/10.1126/sciadv.aba8866 Text en Copyright © 2020 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works. Distributed under a Creative Commons Attribution NonCommercial License 4.0 (CC BY-NC). https://creativecommons.org/licenses/by-nc/4.0/ https://creativecommons.org/licenses/by-nc/4.0/This is an open-access article distributed under the terms of the Creative Commons Attribution-NonCommercial license (https://creativecommons.org/licenses/by-nc/4.0/) , which permits use, distribution, and reproduction in any medium, so long as the resultant use is not for commercial advantage and provided the original work is properly cited.
spellingShingle Research Articles
Choi, Junho
Hsu, Wei-Ting
Lu, Li-Syuan
Sun, Liuyang
Cheng, Hui-Yu
Lee, Ming-Hao
Quan, Jiamin
Tran, Kha
Wang, Chun-Yuan
Staab, Matthew
Jones, Kayleigh
Taniguchi, Takashi
Watanabe, Kenji
Chu, Ming-Wen
Gwo, Shangjr
Kim, Suenne
Shih, Chih-Kang
Li, Xiaoqin
Chang, Wen-Hao
Moiré potential impedes interlayer exciton diffusion in van der Waals heterostructures
title Moiré potential impedes interlayer exciton diffusion in van der Waals heterostructures
title_full Moiré potential impedes interlayer exciton diffusion in van der Waals heterostructures
title_fullStr Moiré potential impedes interlayer exciton diffusion in van der Waals heterostructures
title_full_unstemmed Moiré potential impedes interlayer exciton diffusion in van der Waals heterostructures
title_short Moiré potential impedes interlayer exciton diffusion in van der Waals heterostructures
title_sort moiré potential impedes interlayer exciton diffusion in van der waals heterostructures
topic Research Articles
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7531884/
https://www.ncbi.nlm.nih.gov/pubmed/32967823
http://dx.doi.org/10.1126/sciadv.aba8866
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