Cargando…
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...
Autores principales: | , , , , , , , , , , , , , , , , , , |
---|---|
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 |
_version_ | 1783589818420166656 |
---|---|
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. |
format | Online Article Text |
id | pubmed-7531884 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2020 |
publisher | American Association for the Advancement of Science |
record_format | MEDLINE/PubMed |
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 |
work_keys_str_mv | AT choijunho moirepotentialimpedesinterlayerexcitondiffusioninvanderwaalsheterostructures AT hsuweiting moirepotentialimpedesinterlayerexcitondiffusioninvanderwaalsheterostructures AT lulisyuan moirepotentialimpedesinterlayerexcitondiffusioninvanderwaalsheterostructures AT sunliuyang moirepotentialimpedesinterlayerexcitondiffusioninvanderwaalsheterostructures AT chenghuiyu moirepotentialimpedesinterlayerexcitondiffusioninvanderwaalsheterostructures AT leeminghao moirepotentialimpedesinterlayerexcitondiffusioninvanderwaalsheterostructures AT quanjiamin moirepotentialimpedesinterlayerexcitondiffusioninvanderwaalsheterostructures AT trankha moirepotentialimpedesinterlayerexcitondiffusioninvanderwaalsheterostructures AT wangchunyuan moirepotentialimpedesinterlayerexcitondiffusioninvanderwaalsheterostructures AT staabmatthew moirepotentialimpedesinterlayerexcitondiffusioninvanderwaalsheterostructures AT joneskayleigh moirepotentialimpedesinterlayerexcitondiffusioninvanderwaalsheterostructures AT taniguchitakashi moirepotentialimpedesinterlayerexcitondiffusioninvanderwaalsheterostructures AT watanabekenji moirepotentialimpedesinterlayerexcitondiffusioninvanderwaalsheterostructures AT chumingwen moirepotentialimpedesinterlayerexcitondiffusioninvanderwaalsheterostructures AT gwoshangjr moirepotentialimpedesinterlayerexcitondiffusioninvanderwaalsheterostructures AT kimsuenne moirepotentialimpedesinterlayerexcitondiffusioninvanderwaalsheterostructures AT shihchihkang moirepotentialimpedesinterlayerexcitondiffusioninvanderwaalsheterostructures AT lixiaoqin moirepotentialimpedesinterlayerexcitondiffusioninvanderwaalsheterostructures AT changwenhao moirepotentialimpedesinterlayerexcitondiffusioninvanderwaalsheterostructures |